Nicole Richie & Joel Madden Throw Harlow Star-Studded Birthday Bash

Nicole Richie, daughter Harlow and husband Joel Madden attend The 3rd Annual Kidstock Music and Arts Festival at Greystone Mansion on May 31, 2009 in Beverly Hills Nicole Richie, daughter Harlow and husband Joel Madden attend The 3rd Annual Kidstock Music and Arts Festival at Greystone Mansion on May 31, 2009 in Beverly Hills

Harlow Madden turns 3 on Tuesday, but parents Nicole Richie and Joel Madden have already celebrated their daughter’s big day with a slew of their fellow Hollywood celebrities.

According to People, Nicole and Joel hosted a party on Saturday at the Treehouse Social Club in Beverly Hills, Calif., a posh children’s play center, cafe and spa.

The Hollywood guest list reportedly included Jessica Alba and Cash Warren with their daughter Honor, 2, Ellen Pompeo and Chris Ivery with their daughter Stella, 15 months, Gwen Stefani and Gavin Rossdale with sons Kingston, 4, and Zuma, 2, Kourtney Kardashian and son Mason, 1, Sara Gilbert with daughter Sawyer, 3 and Jennifer Meyer Maguire (Tobey’s wife) with children Ruby, 4, and Otis, 20 months.

Harlow’s 16-month-old brother, Sparrow, also enjoyed his big sister’s party.

“It was a fun, casual party. Besides the celebrity kids, Harlow had a few friends from school at the party and she was very excited. The kids played outside in the Treehouse and enjoyed art and crafts projects inside. All the moms chatted while the dads bonded and it was a perfect party for both the adults and the kids,” a source told the mag. “Nicole looked great and had fun at the party. She and Joel definitely looked like happy newlyweds.”

Guests reportedly enjoyed healthy snacks, which included sandwiches. The birthday girl was given a “special” birthday cake, the source added.

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