Jennifer Lopez: 'Goin' In' Launch Party!

Jennifer Lopez sparkles while celebrating the launch of her latest single “Goin’ In” on Saturday (May 26) at Hyde inside the Bellagio Resort and Casino in Las Vegas.

The 42-year-old entertainer held hands with backup dancer and boyfriend Casper Smart as they made their way inside.

PHOTOS: Check out the latest pics of Jennifer Lopez

“Goin’ In” will be featured on the Step Up 4 soundtrack, and will be available for download on iTunes beginning June 17.

If you haven’t heard Jen‘s latest single, check it out here!

10+ pictures inside of Jennifer Lopez and Casper Smart at the launch party…