Proud dad and veteran funnyman Jerry Stiller was the life of the party at his son Ben’s 50th birthday soiree, spies said.

The comic and former “Seinfeld” actor, 88, even took over the dance floor at the Gramercy Park Hotel surprise party on Saturday night, where DJ Stretch Armstrong spun tunes.

“Ben’s father turned up on the dance floor to [songs by rappers] Drake, A$AP Rocky and Kendrick Lamar,” said a spy. Jerry also gave a speech praising Ben — “It was a funny toast, and he told the crowd Ben had done far better than he ever could have.”

Ben and Jerry StillerGetty Images

Jerry’s beloved wife and comedy partner, and Ben’s mom, Anne Meara, died at 85 earlier this year.

Meanwhile, Ben praised his wife, “Zoolander” co-star Christine Taylor, who threw him the party.

“He walked in with a ‘Zoolander’ face,” a guest said. “He was super happy and pumped — he was very appreciative and thanked her for the party.”

Guests included Robert De Niro and wife Grace Hightower, Owen Wilson and Michael Rapaport. The bash went till midnight, we hear.