Cameron Diaz danced the night away with Naomi Campbell and Bar Refaeli while Keith Richards snarled at scantily clad busboys at the swinging Studio 54 reunion bash.

The raucous, “one-night only” reunion party with SiriusXM Radio drew many of the original faces, including owner Ian Schrager, legendary doorman Marc Benecke and Richie Notar, the first shirtless busboy, who’s now a Nobu co-owner.

The place was so packed with club kids, near-naked waiters and glamour ghouls that staffers for Givenchy designer Riccardo Tisci freaked out that their precious leader was squashed. One screamed, “You are pushing Mr. Tisci from Givenchy!” in heavily Frenchaccented English.

Just like in the old days, West 54th Street was clogged with throngs clamoring to get in. “If you’re not Cameron Diaz, you’re not getting in,” a bouncer yelled. Vanity Fair’s Bob ColacelloVito Schnabel and Tony Shafrazi struggled at the door, but did get in. One unlucky rejectee stomped off straight into a pile of steaming horse dung.

The legendary disco was owned by Schrager and Steve Rubell until 1986. Schrager told us, “I’ve turned down Studio 54 parties for 30 years, but I couldn’t miss this. It was like a time capsule taking me back, very nostalgic. We don’t have anything like that in New York now. It was a spectacle, and it was great fun.”

Of his partner Steve, who died of AIDS in 1989, Schrager said, “He would have loved it. It was the real deal. I could almost see Steve in the DJ booth stopping the music and inviting everybody to go to the bar for a free drink.”

While Nikki Haskell hit the dance floor — making out with a mystery man — the balconies, once known for sexual trysts, were turned into a VIP area with less action, but drew Clive DavisMaxwellDenise Rich and Kevin Bacon. But Bravo’s Andy Cohen stormed off when he was turned away by security because he didn’t have a VIP wristband. [Page Six]