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.