LEGO 42666 Cat Birthday Party & Tree House: Set Guide

Specifications

Set number	42666
Release year	2025
Piece count	321
Minifigures	2
Theme	Friends
Building instructions	Download the instructions on lego.com

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LEGO Friends 42666 Cat Birthday Party & Tree House depicts a cat birthday scene built around a tree house style play structure. Released in 2025, it belongs to the Friends theme and contains 321 pieces.

Within LEGO Friends, this set focuses on a pet themed party scene rather than a vehicle or a large building. The subject fits the theme’s emphasis on character based play, everyday locations and animal care, with cats placed at the centre of the story.

The model uses 321 pieces and includes 2 named mini-dolls: Paisley, wearing a bright light yellow top and medium lavender skirt, and Leo, wearing a red shirt and yellow shorts. The French retail title also identifies 5 animal figures. Notable listed elements include a rotating table, a piñata and party accessories.

The set is mainly suited to narrative play, with small interactions between the characters, animals and celebration elements. It can also be displayed as a compact Friends pet scene, or placed alongside other Friends sets that depict leisure spaces, homes and animal focused activities.

Included minifigures

Frequently asked questions

How many pieces does LEGO set 42666 Cat Birthday Party & Tree House have?

LEGO set 42666 Cat Birthday Party & Tree House has 321 pieces. It was released in 2025 as part of the Friends theme.

What year was LEGO set 42666 released?

Set 42666 Cat Birthday Party & Tree House was released in 2025 and belongs to the Friends theme.

Which minifigures are included in set 42666?

Number of minifigures in LEGO set 42666 Cat Birthday Party & Tree House: 2. Their names and quantities are listed in the “Included minifigures” section.

Where can I find the building instructions for set 42666?

The instructions for LEGO set 42666 Cat Birthday Party & Tree House can be downloaded free as a PDF from the official lego.com website, under “Building Instructions”, by entering the number 42666.

Which named mini-dolls are included in set 42666?

The set includes Paisley in a bright light yellow top and medium lavender skirt, and Leo in a red shirt and yellow shorts.

What party features are identified for this set?

The listed features include a rotating table, a piñata and party accessories, matching the cat birthday party setting.