Singer Jennifer Lopez performs a medley of songs with Pitbull (R) at the 2011 American Music Awards in Los Angeles on November 20, 2011. REUTERS/Mario Anzuoni

Newly single Jennifer Lopez stole the show at the American Music Awards with her raunchiest dance routine yet – in front of her estranged husband.

There was a stellar line-up of stars at the event, including Christina Aguilera, Justin Bieber, David Guetta, Nicki Minaj, Chris Brown and Katy Perry.

But it was J.Lo’s raunchy performance of On The Floor, which she performed with new toyboy Casper Smart, that was the hot topic of conversation.

Indulged

The 42-year-old, who seems to be taking a leaf out of ageing pop icon Madonna’s book on concert performance, indulged in a seductive performance in which she writhed around on stage with her troupe of dancers.

The lekker lyf seemed to be trying to make someone jealous as she stuck her sexy rear in rapper Pitbull’s crotch.

The mother of two wore an extremely provocative catsuit covered in crystals which showed plenty of flesh.

Pitbull later shared the stage with J-Lo’s estranged husband, Marc Anthony.

And if her sexy performance wasn’t enough to make even her ex jealous, she also took to the stage with her new lover, Casper, who danced next to her topless.

It seems the dancer was pleased with their performance.

After the show he tweeted: “Just killlllled the show with @JLo at the #AMAs2011!!!!” - Daily Voice