Only in Hollywood could an event like a baby's birthday party attract both rock stars and reality stars.

The appropriately named Treehouse Social Club in Beverly Hills was the setting for the birthday bash on Saturday afternoon. And while it was a celebration for the kids, that didn't stop the parents from taking part in the fun. On the invite list were Gwen Stefani and her adorable children, Zuma and Kingston. Daddy Gavin Rosdale joined them soon after.

Also making an appearance: Kourtney Kardashian and Scott Disick with baby Mason, plus Kris Jenner. Joel Madden and Harlow Madden also came ready to party, but Nicole Ritchie was a no-show.

By the look of that cake, the kids were probably sent home with the requisite birthday sugar high.

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