The 44-year-old American Idol judge showed off her figure in a slinky multicoloured print dress while she posed for a photo with Casper on Thursday night (26 September).
Jennifer completed her look with cobalt blue boots and a brown clutch bag. Meanwhile, Casper kept it casual in a black jumper, jeans and red trainers.
The dancer seemed more than happy to have Jennifer by his side and he put a protective arm around the singer as they stood behind a water fountain.
The loved-up couple went public with their romance in 2011, shortly after Jennifer split from husband Marc Anthony, and it looks like they're still going strong.
J.Lo has been intent on making fashion statements this week, as she also worked the double denim trend during the American Idol auditions in Austin.
Posting a photo to Instagram, the mum of two showed off her washboard stomach in a crop top and boyfriend jeans.
Accessorising with some bling jewellery and keeping her brunette locks sleek, Jennifer captioned the snap: "#IdolFashion".
Jennifer returned to the US singing show this year, after previously serving as a judge on the tenth and eleventh season alongside Steven Tyler and Randy Jackson.
Jennifer is now back for season 13 of the singing competition, where she's currently searching for America's next singing star alongside Keith Urban and new judge Harry Connick Jr.
Watch Jennifer's video for 'Live It Up' featuring Pitbull: