Harlow Madden's Star-Studded 3rd Birthday Bash

Making for quite the star-studded celebration, a pack of Tinseltown's finest gathered together for Nicole Richie's daughter Harlow Madden's 3rd birthday party on Saturday (January 8).

The former "Simple Life" star toted son Sparrow in her arms while entering the Tree House Social Club locale to prep for her little girl's afternoon fete with a little help from hubby Joel Madden.

As for the guest list, Jessica Alba, Cash Warren and Honor Marie turned up along with Gwen Stefani, Gavin Rossdale and their dapperly dressed son Kingston.

Rounding out the weekend partiers were Ellen Pompeo
and family, as well as Kourtney Kardashian and son Mason Dash Disick.

Enjoy the pictures of the stars out at Tree House Social Club for Nicole Richie's daughter Harlow Madden's birthday party (January 8).