(Photos: Getty Images)

Jennifer Lopez and Ben Affleck’s relationship is officially official — with new photos of them kissing.

The couple, back together 17 years after calling off their engagement, was together Sunday at see-and-be-seen spot Nobu in Malibu. Page Six obtained the exclusive photos and video of them kissing — extensively — during the meal, which was also attended by Lopez’s two children, Emme and Max.

It was a party celebrating J.Lo’s sister Lynda Lopez’s 50th birthday — and was also attended by Lopez’s longtime manager and friend Benny Medina. “Everyone seemed great and had fun,” a source told People magazine.

Especially Bennifer 2.0. The singer-dancer-actress, 51, wore a flowing white dress with Affleck, 48, in a button-down shirt and sports coat while they openly kissed and cuddled in front of family, friends and her kids with third husband Marc Anthony. They later were arm in arm at the valet stand retrieving their rides.

“Jen and Ben sat next to each other and were very affectionate,” the source told People. “They held hands under the table.”