Nicole Richie, Harlow Madden

Fame Pictures

Happy third birthday, Harlow Richie-Madden!

Nicole and Joel's adorable daughter celebrated her birthday this weekend with a star-studded bash in Beverly Hills, where the guest list read like a who's who in Hollywood.

So which celebs and their offspring attended?

Gwen Stefani and Gavin Rossdale along with Kingston and Zuma; Jessica Alba and Honor; Ellen Pompeo and Stella; and Kourtney Kardashian and Mason were all at the Tree House Social Club.

Other famous faces at the fete included Buzz Lightyear from Toy Story and Ariel from The Little Mermaid. "Nicole and Joel chose those characters," the manager of the children's spot tells me.

The kids made magic wands and decorated tank tops and tote bags at the arts-and-crafts bash. Birthday girl Harlow blew out the candles on her Sleeping Beauty-themed castle-shaped cake.

Even though Harlow was the guest of honor, baby brother Sparrow donned a suit for the special occasion.

"Joel and Nicole were thrilled," a source says, adding: "It wasn't a bunch of nannies. Everyone was really hands on with the kids and had a great time."

Sounds like fun to us!

PHOTOS: Famous Families

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