Cat Birthday Party & Tree House

The LEGO® Cat Birthday Party & Tree House (set 42666) is a 321-piece LEGO Friends set released in 2025, throwing a feline birthday bash for Heartlake City cat Churro. The tree house features a fish-shaped piñata, a cat toy, cat grass, a water fountain, and a litter box, with a rotating table for serving Churro's birthday cake. Includes minidolls of Leo and Paisley plus five cat figures — Churro and four feline guests — alongside birthday presents, banners, and cat-shaped balloons. A specifically pet-centered Friends set where the entire scene is engineered around the cats rather than the humans.