Kendall Jenner — who Page Six exclusively reported this week has split from NBA star Ben Simmons — was dancing past 6 a.m. at club king Richie Akiva’s after-party following the starry amfAR Gala in Cannes, France. And carefree Jenner was even shimmying with an ex-beau of her sister, Kourtney Kardashian.

A spy said that at the Cap d’Antibes mansion Domaine la Dilecta — following the annual gala at the Hôtel du Cap-Eden-Roc — “Kendall danced all night, and was singing along to Kanye’s, ‘I Love It.’ She even changed outfits and danced with [Kourtney’s ex] Luka Sabbat.”

We’re told Jenner danced until well after 6 a.m. Mariah Carey and Dua Lipa had performed at the amfAR event, which Jenner attended with her mom, Kris. Guests also included Orlando Bloom and Tiffany Trump.

Later at Akiva’s annual after-party, “DJ Cassidy started spinning at around 4 a.m.,” a source said. “Everyone was busting moves on the floor. It was at a huge villa in Antibes. There must have been 500 people outside. No one could get in. It was madness.”

Also at the wild party, Dua Lipa danced and sang along to her song “One Kiss.” Adriana Lima boogied when Brazilian music came on, and Chris Tucker busted out Michael Jackson routines.

“Not one person had left by 6 a.m. They must’ve stayed until at least 8 a.m.,” our source said.

By day, Jenner had also been photographed in a bikini hanging with Sabbat at the Hôtel du Cap. He has a role in Cannes’ opening film this year, director Jim Jarmusch’s zombie flick “The Dead Don’t Die.”

Page Six exclusively reported this week that Jenner and Simmons called it quits. The Philadelphia 76ers star was seen, sources told us, partying with about 20 pals in Atlantic City, NJ, including a birthday dinner for a buddy at Kuro at the Hard Rock Hotel& Casino — and later at legendary jiggle joint Scores.

Reps did not comment on the split.