So the pair made sure they got in one last fun outing together – going wake boarding, a a form of water ski-ing, at Long Beach, California.
Twenty five-year-old Casper tweeted a snap of the pair on a boat, revealing that Jennifer had succeeded in getting up on the board on her first go.
At least the lovebirds will still be seeing each other on stage each night during the On The Floor singer's tour.
Jennifer looked stunning at the opening night gig in Montreal, Canada.
She showed off her moves in a series of revealing outfits, including a skin-coloured catsuit adorned with crystals and a beautiful floor length blue gown.
Jennifer revealed on Friday that she is quitting her job on the American Idol judging panel.
But recent reports suggest that bosses declined to keep her on because she wanted an extra $2 million on top of the $15 million she was paid last year.
The 42-year-old beauty told of her decision to leave turing a tearful phonecall to the radio show of American Idol host Ryan Seacrest.
"When I signed on to Idol I signed on for one year and I wound up doing two years because I just fell so in love with the show, everybody there... and I didn’t know I’d be so moved emotionally by working on the show," she said.
But she went on: "Something has to give. I really was dreading this phone call, and you’re gonna make me cry.
"I honestly feel the time has come that I have to get back to doing the other things that I do that I have kind of put on hold because I love Idol so much.
"I could keep just doing Idol for the rest of my life but that would be giving up a bunch of other things. We had an amazing run."