Fashion mogul Vera Wang celebrated her 65th birthday over the weekend, but she partied like a rock star rather than a senior citizen.

Spies said that Wang — who’s designed wedding gowns for Chelsea Clinton, Mariah Carey and Jennifer Lopez — was floating up to Nikki Beach in Mallorca, Spain, on Sunday “on a 130-foot yacht with 12 friends.”

Wearing shades and a midriff-baring top that “showed off her toned stomach,” Wang and company took a table at the club, where they ordered sushi and a 6-liter Methuselah of the hot spot’s signature rosé to guzzle.

When dancers entertained the crowd, Wang got in on the act.

“She got up on a poolside podium and showed off some impressive moves,” said a spy, “before heading to the club’s beach area to dance under the island sunset.”

She even posed for pics with a group of sexy servers carrying sparklers and wearing ­Native American-inspired headdresses and their own provocative outfits.

Meanwhile, Clive Davis and NBA star Blake Griffin were spotted at the Nikki Beach outpost in St. Tropez.