Pictures of Gwen Stefani, Jessica Alba, Ellen Pompeo, Nicole Richie and Their Kids at Harlow Madden's Third Birthday Party

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Harlow Madden was the guest of honor Saturday at a bash her parents, Nicole Richie and Joel Madden, threw to celebrate her third birthday, which is actually Tuesday, at the Treehouse Social Club. Lots of Nicole and Joel's famous friends brought their little ones along, including Gwen Stefani and Gavin Rossdale's boys Zuma and Kingston and Jennifer Meyer Maguire with Otis and Ruby. Ellen Pompeo and Chris Ivery brought a sunglass-wearing Stella Luna, and Jessica Alba accompanied Cash and Honor Warren to their latest party. It was apparently a great, fun day for the adults too, as Joel later tweeted, "Great day today."