Jennifer Lopez rocked the 2011 American Music Awards with her raunchy performance, her barely-there dress and her private after-party lap dance.

Lopez was the talk of the town when she appeared on stage wearing a glittering body stocking reminiscent of Britney Spears' ensemble from the 2000 MTV Video Music Awards performance (and from her Toxic music video).

Lopez gyrated on the Nokia Theatre stage with rapper Pitbull to a medley of her newest hits, including Until It Beats No More, Papi and On the Floor.

Then she climbed into a white Fiat, which was conveniently positioned in the middle of the stage, and continued her performance some more.

Critics are accusing the Latina pop star of showcasing a glorified Fiat commercial Sunday night, only amping up the raunch factor with some scandalous moves.

Even fellow artists took to Twitter to complain about the bit.

Yo. I know I didn't just see that dumb Fiat. I KNOW I didn't just see that friggin' Fiat, tweeted QuestLove, from The Roots.

In response, John Legend tweeted back: That had to be the most shameless thing I've ever seen in a performance. I was genuinely shocked.

Lopez was slammed by media outlets for flagrantly promoting Fiat, a brand that she is a spokes model for.

Jennifer Lopez gave what will surely be the most cringe-inducing, embarrassing performance of the night, wrote The Los Angeles Times. It wasn't that Lopez wasn't really wearing any clothes, as audiences expect that nowadays. Instead, it was Lopez's choice of an accessory, which in this case was a car. When the actual commercial ran not too long after the performance, the only difference was the emphasis on the name of the brand.

Then there was the dress.

In similar fashion with the rhinestoned nude body suit, after her performance Lopez changed into a black Zuhair Murad couture gown with beaded black embroidery woven over see-through silk. The dress, from the Fall 2011 line, had one sleeve and a thigh-high split.The fabric just barely covered her chest.

She wore this ensemble as she accepted her Best Latin Music Artist.

Lopez's name has been in the headlines before for her bold fashion choices. Does anyone remember the infamous green Versace dress from 2000?

After the AMA show, Lopez went to the Graystone Manor in West Hollywood where the 42-year-old singer displayed some PDA with new beau, 24-year-old dancer Casper Smart.

Us Weekly reports that Lopez, once inside the venue, grabbed Smart's hand and led him into a private DJ booth. She danced in her seat to a Michael Jackson mix, then supposedly grinded in Smart's lap, while kissing him and rubbing his head.

At 12:45 a.m. the couple left, hand in hand, with Lopez's entourage in tow. Us reports that Smart was a bit bashful about all the attention he was receiving.

Regardless of whether people agree with Lopez's behavior or not, the mother of two certainly looks good doing it.

What did you think of Lopez's performance? Leave your feedback in the comments section below.