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321

LEGO

Cat Birthday Party & Tree House

Reference: #42666 · released in 2025

Themes: Friends

The LEGO Cat Birthday Party & Tree House set, released in 2025 in the Friends theme, includes 321 parts and 2 minidolls, featuring Leo and Paisley.

This set from LEGO includes a total of 321 parts distributed across 146 distinct unique parts.

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321

Total parts

146

Unique parts

LEGO

Universe

Booklet 1/2 10.45 MB

Booklet 2/2 32.89 MB

Set parts (146)

321 parts in the box

Hose Rigid 3mm D. 9L / 7.2cm

Hose Rigid 3mm D. 9L / 7.2cm

Black

Plate Special Round 1 x 2 Half Circle with Stud (Jumper)

Plate Special Round 1 x 2 Half Circle with Stud (Jumper)

Blue

Tile Round 1 x 2 Half Circle

Tile Round 1 x 2 Half Circle

Medium Azure

Minidoll Hips and Cargo Pants with Nougat Legs, Medium Azure/White Shoes Print [Thin Hinge]

Minidoll Hips and Cargo Pants with Nougat Legs, Medium Azure/White Shoes Print [Thin Hinge]

Yellow

Plant, Leaves 4 x 3

Plant, Leaves 4 x 3

Lime

Tile 1 x 4 with Groove

Tile 1 x 4 with Groove

Bright Green

Hair Long, Wavy Across Face

Hair Long, Wavy Across Face

Dark Red

Animal, Cat, Chubby with orange Face, Toes, Medium Blue/Lime Eyes Print

Animal, Cat, Chubby with orange Face, Toes, Medium Blue/Lime Eyes Print

White

Animal, Cat, Chubby with Bright Green Eyes, Light Bluish Grey Fur Print

Animal, Cat, Chubby with Bright Green Eyes, Light Bluish Grey Fur Print

Dark Bluish Gray

Container Box 2 x 2 x 1 Reinforced Bottom

Container Box 2 x 2 x 1 Reinforced Bottom

Bright Light Orange

Container Box 2 x 2 x 1 Reinforced Bottom

Container Box 2 x 2 x 1 Reinforced Bottom

Bright Pink

Brick Special 1 x 2 with Grille

Brick Special 1 x 2 with Grille

Tan

Brick 2 x 3

Dark Orange

Brick 1 x 2

Dark Orange

Brick 1 x 2

Bright Light Orange

Brick 1 x 2

Coral

Brick 1 x 1

Medium Azure

Brick 1 x 1

Bright Light Orange

Brick 1 x 1

Coral

Brick 1 x 4

Medium Azure

Plate 2 x 4

Orange

Plate 2 x 4

Medium Lavender

Plate 2 x 3

Light Aqua

Plate 2 x 2

Light Bluish Gray

Plate 1 x 2

Dark Orange

Plate 6 x 10

Lime

Tile 2 x 2 with Groove

Tile 2 x 2 with Groove

Bright Pink

Tile 2 x 2 with Groove

Tile 2 x 2 with Groove

Bright Light Orange

Tile 1 x 2 with Groove

Tile 1 x 2 with Groove

Medium Azure

Tile 1 x 2 with Groove

Tile 1 x 2 with Groove

Dark Turquoise

Tile 1 x 2 with Cat Food Box, Cat, White 'MEOW BITS' Print

Tile 1 x 2 with Cat Food Box, Cat, White 'MEOW BITS' Print

Light Aqua

Brick Sloped 33° 3 x 2

Brick Sloped 33° 3 x 2

Reddish Brown

Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]

Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]

Reddish Brown

Brick 1 x 3

White

Brick Arch 1 x 4

Brick Arch 1 x 4

Bright Light Orange

Technic Brick 1 x 2 [1 Pin Hole]

Technic Brick 1 x 2 [1 Pin Hole]

Reddish Brown

Plate 1 x 4

Bright Green

Equipment Shovel [Rounded Handle End]

Equipment Shovel [Rounded Handle End]

Flat Silver

Antenna 1 x 4 with Flat Top

Antenna 1 x 4 with Flat Top

Dark Orange

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Medium Azure

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Medium Nougat

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Bright Pink

Brick Special 1 x 1 with Headlight

Brick Special 1 x 1 with Headlight

Bright Light Blue

Technic Pin 1/2 without Friction Ridges

Technic Pin 1/2 without Friction Ridges

Light Bluish Gray

Plate 1 x 10

Medium Azure

Dish 2 x 2 Inverted [Radar]

Dish 2 x 2 Inverted [Radar]

Trans-Light Blue

Dish 2 x 2 Inverted [Radar]

Dish 2 x 2 Inverted [Radar]

Blue

Plant, Leaves Stacked 4 x 5 x 1 2/3

Plant, Leaves Stacked 4 x 5 x 1 2/3

Bright Green

Plant, Leaves Stacked 4 x 5 x 1 2/3

Plant, Leaves Stacked 4 x 5 x 1 2/3

Lime

Brick Round 2 x 2 Dome Top with 2 Ears

Brick Round 2 x 2 Dome Top with 2 Ears

Bright Pink

Plant, Flower, Peony Rose with 2 Layers

Plant, Flower, Peony Rose with 2 Layers

Medium Lavender

Plate Round Corner 6 x 6

Plate Round Corner 6 x 6

Blue

Plate Round Corner 6 x 6

Plate Round Corner 6 x 6

Lime

Plate Round 1 x 1 with Solid Stud

Plate Round 1 x 1 with Solid Stud

Bright Pink

Plate Round 1 x 1 with Solid Stud

Plate Round 1 x 1 with Solid Stud

Trans-Light Blue

Brick Arch 1 x 4 x 2

Brick Arch 1 x 4 x 2

Coral

Cylinder Half 2 x 4 x 4

Cylinder Half 2 x 4 x 4

Tan

Wool / Yarn

Dark Pink

Wool / Yarn

Bright Light Yellow

Headwear Accessory Hat with Small Pin, Cap

Headwear Accessory Hat with Small Pin, Cap

Lime

Bar Holder with Clip

Bar Holder with Clip

White

Minidoll Torso Boy with Magenta/Coral Jacket, Medium Blue Trim, White Shirt, Orange/Azure Shapes Print, Medium Nougat Arms and Hands

Minidoll Torso Boy with Magenta/Coral Jacket, Medium Blue Trim, White Shirt, Orange/Azure Shapes Print, Medium Nougat Arms and Hands

Medium Nougat

Plate Special 1 x 2 with Clip Horizontal on Side

Plate Special 1 x 2 with Clip Horizontal on Side

White

Brick Curved 2 x 1 No Studs [1/2 Bow]

Brick Curved 2 x 1 No Studs [1/2 Bow]

Bright Green

Animal, Cat, Sitting with Dark Brown Stripes, White Chest, Ears Print

Animal, Cat, Sitting with Dark Brown Stripes, White Chest, Ears Print

Medium Brown

Headwear Accessory Bow with Heart, Long Ribbon and Pin

Headwear Accessory Bow with Heart, Long Ribbon and Pin

Lavender

String with End Studs 11L Overall

String with End Studs 11L Overall

Black

Brick Arch 1 x 5 x 4 [Continuous Bow, Raised Underside Cross Supports]

Brick Arch 1 x 5 x 4 [Continuous Bow, Raised Underside Cross Supports]

Tan

Brick Arch 1 x 6 x 2 - Thin Top without Reinforced Underside [New Version]

Brick Arch 1 x 6 x 2 - Thin Top without Reinforced Underside [New Version]

Medium Azure

Brick Round 2 x 2 Dome Bottom [Open Stud]

Brick Round 2 x 2 Dome Bottom [Open Stud]

Bright Pink

Brick Curved 1 x 3 x 2 Inverted [Inside Bow]

Brick Curved 1 x 3 x 2 Inverted [Inside Bow]

Medium Azure

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Blue

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Dark Pink

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Bright Green

Plant, Flower with 5 Pointed Petals and Pin

Plant, Flower with 5 Pointed Petals and Pin

Light Aqua

Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side

Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side

Dark Turquoise

Bar Holder with Hole and Bar Handle

Bar Holder with Hole and Bar Handle

Reddish Brown

Large Figure Weapon Lightsaber Hilt with Axle Hole and Two Bar Holders

Large Figure Weapon Lightsaber Hilt with Axle Hole and Two Bar Holders

Reddish Brown

Headwear Accessory Hat with Small Pin, Clown / Party with Pin

Headwear Accessory Hat with Small Pin, Clown / Party with Pin

Pearl Gold

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Bright Green

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Lavender

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Bright Light Yellow

Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end

Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end

Tan

Tile 2 x 3

Blue

Turntable 2 x 2 Female

Turntable 2 x 2 Female

White

Tile 2 x 2 Curved, Macaroni

Tile 2 x 2 Curved, Macaroni

Coral

Bar 4L (Lightsaber Blade / Wand)

Bar 4L (Lightsaber Blade / Wand)

White

Plate Special 1 x 2 with Door Rail

Plate Special 1 x 2 with Door Rail

Tan

Technic Axle 2 Notched

Technic Axle 2 Notched

Red

Plant, Plate 1 x 1 Round with 3 Leaves

Plant, Plate 1 x 1 Round with 3 Leaves

Bright Green

Plant, Plate 1 x 1 Round with 3 Leaves

Plant, Plate 1 x 1 Round with 3 Leaves

Yellowish Green

Brick Curved Inverted 2 x 2 x 2/3

Brick Curved Inverted 2 x 2 x 2/3

Bright Light Blue

Plate Special Round 1 x 1 with Hollow Stud and Horizontal Bar 1L

Plate Special Round 1 x 1 with Hollow Stud and Horizontal Bar 1L

Black

Headwear Accessory Crown / Tiara

Headwear Accessory Crown / Tiara

Pearl Gold

Plate Special 4 x 4 with 3 x 3 Quarter Round Cutout

Plate Special 4 x 4 with 3 x 3 Quarter Round Cutout

Yellow

Plate Special 4 x 4 with 3 x 3 Quarter Round Cutout

Plate Special 4 x 4 with 3 x 3 Quarter Round Cutout

Bright Pink

Plate Special 1 x 2 Rounded with 2 Open Studs

Plate Special 1 x 2 Rounded with 2 Open Studs

Tan

Plate Special 1 x 2 Rounded with 2 Open Studs

Plate Special 1 x 2 Rounded with 2 Open Studs

Bright Green

Minidoll Hips and Shorts with Warm Tan Legs, Dark Tan Shoes, White Laces, Socks, Laces

Minidoll Hips and Shorts with Warm Tan Legs, Dark Tan Shoes, White Laces, Socks, Laces

Medium Lavender

Brick Curved 1 x 2 x 1 No Studs

Brick Curved 1 x 2 x 1 No Studs

Tan

Plant, Stem with 3 Leaves and Bottom Pin

Plant, Stem with 3 Leaves and Bottom Pin

Bright Green

Equipment Candlestick

Equipment Candlestick

Black

Equipment Candlestick

Equipment Candlestick

Reddish Brown

Wave / Flame Small with Pin

Wave / Flame Small with Pin

Trans-Orange

Hair Scruffy and Swept Right

Hair Scruffy and Swept Right

Reddish Brown

Plate 8 x 8 with Rounded End

Plate 8 x 8 with Rounded End

Magenta

Brick Special 1 x 1 with Studs on 2 Sides

Brick Special 1 x 1 with Studs on 2 Sides

Blue

Wedge Plate 2 x 4

Wedge Plate 2 x 4

Blue

Plate Round 1 x 1 Swirled Top / Poo

Plate Round 1 x 1 Swirled Top / Poo

Reddish Brown

Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small

Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small

Bright Green

Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)

Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)

Bright Light Blue

Technic Axle Connector Hub with 3 Axles at 120°

Technic Axle Connector Hub with 3 Axles at 120°

Light Bluish Gray

Technic Axle Connector Smooth [with x Hole + Orientation]

Technic Axle Connector Smooth [with x Hole + Orientation]

Tan

Cone 1 x 1 [Top Groove]

Cone 1 x 1 [Top Groove]

Tan

Cone 1 x 1 [Top Groove]

Cone 1 x 1 [Top Groove]

Trans-Light Blue

Window 1 x 4 x 3 without Shutter Tabs

Window 1 x 4 x 3 without Shutter Tabs

White

Animal, Fish [Hollow Stud Mouth]

Animal, Fish [Hollow Stud Mouth]

Bright Light Blue

Plate Special 2 x 4 with Groove and Two Center Studs (Jumper)

Plate Special 2 x 4 with Groove and Two Center Studs (Jumper)

Bright Green

Animal, Cat, Kitten Sitting with Open Eyes, White Mouth, Nougat Paws Print

Animal, Cat, Kitten Sitting with Open Eyes, White Mouth, Nougat Paws Print

Nougat

Animal, Cat, Kitten Sitting with Yellow Eyes, Dark Pink Tongue Print

Animal, Cat, Kitten Sitting with Yellow Eyes, Dark Pink Tongue Print

Black

Plate Special 2 x 2 x 2/3 with Axle Hole and Grill on Sides (Haybale)

Plate Special 2 x 2 x 2/3 with Axle Hole and Grill on Sides (Haybale)

Tan

Plate Special 1 x 2 with Clip Vertical on End

Plate Special 1 x 2 with Clip Vertical on End

Reddish Brown

Bar 2L with Stop in Center

Bar 2L with Stop in Center

White

Bar 2L with Stop in Center

Bar 2L with Stop in Center

Tan

Bar 2L with Stop in Center

Bar 2L with Stop in Center

Reddish Brown

Brick Curved 2 x 1 with Inverted Cutout

Brick Curved 2 x 1 with Inverted Cutout

Bright Light Orange

Brick Curved 2 x 1 with Inverted Cutout

Brick Curved 2 x 1 with Inverted Cutout

Coral

Flag 2 x 2 Square, Flared Clip Edge [Thick Clips]

Flag 2 x 2 Square, Flared Clip Edge [Thick Clips]

White

Brick Special 1 x 2 with 1 Center Stud on 1 Side, Bottom Stud Holder

Brick Special 1 x 2 with 1 Center Stud on 1 Side, Bottom Stud Holder

Bright Light Blue

Plate 1 x 1 x 2/3 with Open Stud

Plate 1 x 1 x 2/3 with Open Stud

Dark Orange

Brick Round 4 x 4 Centre Hole

Brick Round 4 x 4 Centre Hole

Yellow

Panel 1 x 2 x 3 [Side Supports / Hollow Studs]

Panel 1 x 2 x 3 [Side Supports / Hollow Studs]

White

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Yellow

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Medium Azure

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Bright Pink

Bar 5L with Handle (Friction Ram)

Bar 5L with Handle (Friction Ram)

Black

Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]

Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]

Tan

Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]

Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]

Green

Minidoll Head, Thick Black Eyebrows, Reddish Brown Eyes, Smile Print

Minidoll Head, Thick Black Eyebrows, Reddish Brown Eyes, Smile Print

Medium Nougat

Minidoll Head, Dark Red Eyebrows, Medium Azure Eyes, Nougat Lips Print

Minidoll Head, Dark Red Eyebrows, Medium Azure Eyes, Nougat Lips Print

Light Nougat

Cupboard 2 x 3 x 2 with Hollow Studs

Cupboard 2 x 3 x 2 with Hollow Studs

Blue

Minidoll Torso Girl with Bright Light Yellow Top, Coral/Dark Blue Shapes, Writing, Lavender Shirt Print, Light Nougat Arms and Hands

Minidoll Torso Girl with Bright Light Yellow Top, Coral/Dark Blue Shapes, Writing, Lavender Shirt Print, Light Nougat Arms and Hands

Light Nougat

Tile Round 1 x 1

Tile Round 1 x 1

Trans-Yellow

Tile Round 1 x 1 with Offset Black Eye Print

Tile Round 1 x 1 with Offset Black Eye Print

White

Tile Round 1 x 1 with Animal Track Print

Tile Round 1 x 1 with Animal Track Print

Medium Nougat

Sticker Sheet for Set 42666-1

Sticker Sheet for Set 42666-1

[No Color/Any Color]

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