Justin Bieber has thanked fans for his "unforgettable" night at the American Music Awards (AMAs).

The pop star took to his Twitter page to gush about his big win at the awards ceremony, which was held at the Nokia Theatre in Los Angeles last night.

Justin dominated the night by scooping all three awards he was nominated for - the coveted Artist of the Year prize, the Favorite Pop/Rock Male Artist honour and Favorite Pop/Rock Album for his platinum-selling third record Believe.

"THANK YOU TO ALL THE FANS...ALL MY #BELIEBERS...WE ARE A FAMILY. TONIGHT WAS FOR ALL OF YOU. OUR AWARDS> THANK YOU> LOVE U," Justin 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...and HAMMER killed it. haha, (sic)".

The man of the moment received appreciation from a host of celebrity fans.

Jenny McCarthy jokingly flirted with the teen idol when she presented him with his best pop/rock record prize. She took the on stage moment as her opportunity to kiss the star on the neck.

"Wow. I feel violated right now," Justin laughed.

"I did grab his butt," Jenny revealed backstage to the NY Daily News. "I couldn't help it. He was just so delicious. So little. I wanted to tear his head off and eat it. Yes it was spontaneous."

Jenny also tweeted about her up-close-and-personal encounter with Justin after the ceremony.

The bubbly blonde posted a picture of her playful grope with Justin along with a caption calling herself a cougar.

Other famous names also tweeted about Justin's mega win at the AMAs.

"Wow Justin was amazing at AMAs! (sic)" Eva Longoria wrote.

"Congrats to my homie @justinbieber for his win just now #AMAs, (sic)" rap star Ludacris added.

"Make that three @justinbieber!!! Well Done! #AMAs, (sic)" tweeted Carly Rae Jepsen.

Along with Justin, Taylor Swift received a massive fan response on the night.

The singer took home the Favorite Country Female Artist honour, for the fifth consecutive time.

Other notable scoops from the ceremony included will.i.am who revealed more about his collaboration with Britney Spears.

will sported two gold rings: one saying Scream and the other Shout in honour of his new single with Britney, which is called Scream & Shout.

"I don't even want to say the word swag. It's beyond swag," he told Billboard.com of the promo.

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