Nicole Richie & Sparrow: Happy Birthday, Harlow!

Nicole Richie and her 1-year-old son Sparrow were spotted leaving big sister Harlow‘s star-studded birthday party at the Tree House Social Club in Beverly Hills, California yesterday (January 8).

The guest list included several famous friends and their tots, including Ruby and Otis Maguire, Mason Disick and Honor Warren just to name a few.

Harlow will be turning 3 years old on January 11 – just one day before Christina Aguilera‘s son Max. Wonder if he was at the bash as well?

Alyson Hannigan & Family: Santa Monica Strollers

Bronx Wentz: Munchin’ At McDonald’s