A low-key family outing at Pink Taco last Thursday wasn't the only celebration Victoria "Posh" Beckham had in mind for her 34th birthday. The former Spice Girl had a celeb-studded affair at Via Veneto restaurant in Santa Monica on Sunday — and the guest list was strictly A-list. "Posh and Becks set the bar for power couples with several others along for the birthday ride, including Tom Cruise and Katie Holmes, Will Smith and Jada Pinkett Smith, Sean "Diddy" Combs and Kim Porter, Usher and his wife, Tameka Foster, Kate Beckinsale and hubby Len Wiseman, and Eva Longoria Parker, among others," an insider tells In Touch. The others included Gwen Stefani and Gavin Rossdale and Elton John. Well, you only turn 34 once, right, Posh?