September 05, 2008 06:35 PM

Following in his parents’ fancy footsteps, Romeo Beckham celebrated his sixth birthday in style with a superhero outing including some fellow famous kids.

Clutching mom Victoria Beckham‘s hand as they walked through Universal CityWalk, Romeo (clad in a superhero costume) “seemed excited,” said an onlooker. “He kept hopping up and down when they exited the movie theatre.”

The festivities kicked into high gear when the group made their way to the Hard Rock Cafe. Eldest son Brooklyn, 9, led the way, walking in front of the gang, which included Heidi Klum, Gavin Rossdale, and Geri Halliwell, who brought along their kids.

“Everyone was smiling and seemed relaxed and happy, despite the chaos caused by fans and paparazzi,” says the onlooker. After about two hours of celebrating, the party died down and families departed one by one.

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