Jennifer Lopez and boyfriend Casper Smart in her new Dance Again video

Jennifer Lopez’s toy boy boyfriend Casper Smart couldn’t resist grabbing his girlfriend’s rear end several times in her new Dance Again video.

The scantily clad couple was positively smouldering in several sexy scenes for the full video version of the song, which debuted on American Idol tonight.

While introducing the video, American Idol host Ryan Secrest took the chance to quiz Jennifer Lopez on her relationship with 24-year-old Casper Smart.

“Is there any special chemistry with you and any of the dancers?” Ryan Secrest asked, much to J Lo’s obvious embarrassment.

J Lo swiftly changed the subject, saying: “It’s fun and dancy and full of joy.”

The video sees Jennifer Lopez, 42, strut around in a strapless black basque and heels while a shirtless Casper Smart dances an intimate number with his girlfriend.

And the couple couldn’t seem to keep their hands off each other as they cavorted in several scenes together.

The steamy video also features Jennifer Lopez crawling over a menagerie of scantily clad models in a room and dancing enthusiastically with Casper Smart while covered in gold glitter.

Casper Smart appears shirtless throughout the video, showing off his large number of tattoos on his muscular torso.

At one point, the couple look to be recreating the famous upside down Spider-Man kiss with Jennifer Lopez sporting a low cut top and a shirtless Casper Smart leaning in for the clinch.

Other shots show Jennifer Lopez sporting beachy tousled hair and subtle make-up while smouldering at the camera as she lip syncs to the catchy number.

The diva wears very little clothing as she cavorts in what appears to be wet sand, while another shows her swishing her hair and dancing wildly.

Casper Smart follows in the footsteps of J Lo’s ex boyfriend Ben Affleck who famously appeared in her 2002 video for Jenny from the Block.