Justin Bieber flexes his ripped biceps as he performs onstage during the 40th American Music Awards held at Nokia Theatre L.A. Live on Sunday.

The pop singer dominated the awards show, winning three trophies, including artist of the year.

Bieber got in some grinding with Nicki Minaj – who shared the stage with him and took home two awards — and a kiss on the neck from presenter Jenny McCarthy.

“Wow. I feel violated right now,” he said, laughing.

“I did grab his butt,” McCarthy said backstage. “I couldn’t help it. He was just so delicious. So little. I wanted to tear his head off and eat it.”

He’s 18.

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Justin Bieber flexes his ripped biceps as he performs onstage during the 40th American Music Awards held at Nokia Theatre L.A. Live on Sunday. The pop singer dominated the awards show, winning three trophies, including artist of the year. Bieber got in some grinding with Nicki Minaj - who shared the...