Jennifer Lopez grinds on and off stage with 24-year-old beau

Lopez's rhinestoned body suit bore a striking resemblance to the ensemble Britney Spears donned at the 2000 MTV VMAs.

Lopez’s rhinestoned body suit bore a striking resemblance to the ensemble Britney Spears donned at the 2000 MTV VMAs. (WireImage)

Jennifer Lopez got tongues wagging both on and off the stage at the American Music Awards Sunday night. The singer not only danced provocatively in a flesh-colored bodysuit for a performance, but gave her 24-year-old boytoy a private lap dance at an after-party, reports say.

Lopez began the night demurely enough, singing a ballad in long, flowing dress on the stage of the Nokia Theatre in Los Angeles. But soon, the “American Idol” judge stopped with a naughty smile and ripped off her dress, revealing a rhinestone-encrusted body suit underneath. It was a strikingly similar ensemble to the one Britney Spears donned for her MTV Video Music Awards performance of “Oops, I Did It Again” in 2000 after stripping off a tuxedo.

As Lopez performed her song “Papi,” the triple threat was surrounded by a small army of male backup dancers, who pulled yet another layer of beading off her bodysuit. When rapper Pitbull appeared on stage, Lopez walked seductively toward him, leaning forward on a cane and rubbing her famous posterior against his crotch.

JENNIFER LOPEZ DATING 24-YEAR-OLD DANCER

PHOTOS: AMERICAN MUSIC AWARDS

The raunchy move might have inspired some jealously in Casper Smart, the tattooed backup dancer Lopez is reportedly dating. He danced shirtless just to Lopez’s right during the song “On the Floor.” After the sexy performance, he tweeted, “Just killlllled the show with @JLo at the #AMAs2011!!!!”

At an after-party later in the night, Lopez headed straight for Smart and dragged him into a booth by his hand, according to Us Weekly. Lopez didn’t seem bothered by their 18 year age difference. Sources saw Lopez give Smart a lap dance to a Michael Jackson medley. The singer also apparently kissed him and rubbed his head. The two left the party hand-in-hand at 12:45 a.m.

Lopez and Smart have allegedly been dating for weeks. The dancer was spotted partying with Lopez in Las Vegas into the wee hours of the night after a performance in late September. A week later, he was seen exiting the star’s hotel in New York.

“Yes, they are dating and having a good time,” a source told People. “They’ve been getting more open with their flirting for weeks.”

Another source called the relationship a “fun fling.”

But Lopez clearly trusts Smart, who has also backup danced for Beyoncé and has a regular gig performing at Club Boulevard in Los Angeles. On Saturday, Lopez sent Smart along with her personal assistant to pick out items at the AMA gifting suite. Among other freebies, Smart selected two Rubik’s Cubes, possibly for Lopez’s twin 3-year-olds, Max and Emme, her children from her seven-year marriage to singer Marc Anthony.