Presenter Jenny McCarthy kisses Justin Bieber as he accepts the award for favorite pop rock album for "Believe" at the 40th American Music Awards in Los Angeles, California, November 18, 2012. Photo: REUTERS/Danny Moloshok

London - Jenny McCarthy groped Justin Bieber's butt at the American Music Awards.

The former Playboy model presented the 18-year-old singer with the pop/rock album prize for his record 'Believe' at the ceremony on Sunday night (18.11.12) and she admits she couldn't resist giving the "delicious" star's rear a squeeze.

Speaking backstage at the AMAs, which took place at Los Angeles' Staples Center, she said: "I did grab his butt. I couldn't help it. He was just so delicious. So little. I wanted to tear his head off and eat it!"

Justin - who also picked up artist of the year and the pop/rock male artist gongs - was also kissed on the neck by 40-year-old Jenny as she gave him the award.

He laughed in response and said: "Wow. I feel violated right now!"

Jenny later posted a picture of the kiss on twitter and wrote: "Cougar rape #poorjustin (sic)"

The 'Boyfriend' hitmaker - who was accompanied to the event by his mother Pattie Mallette - later admitted the evening had been one he would never forget.

He tweeted: "Loss for words tonight. Like i said as long as you BELIEVE in me i will always try to make you proud. Thank you. tonight i will never forget (sic)"

Despite recently splitting from girlfriend Selena Gomez, it has been claimed that Justin was seen backstage holding hands with the 20-year-old beauty.

According to E! News, Selena arrived at the end of the show to meet with the 'Never Say Never' star after the ceremony. - Bang Showbiz