Justin Bieber was so jet-lagged he forgot about his Billboard Music Award wins.

The teen singing sensation - who bagged six gongs, including Top Pop Album for 'My World 2.0', at last night's (22.05.11) ceremony - thinks he must have gone "crazy" because tiredness from travelling back from Japan made him think he had only taken home three trophies.

Writing on his twitter page, he said: "for once waking up because of jet lag is great....because i just found out...

"we won 6 AWARDS 2nite!! I THOUGHT IT WAS 3!!! CRAZY!! I have the GREATESTFANSINTHEWORLD !!! THANK U!!! I LOVE U I LOVE U I LOVE U!! SWAG (sic)"

During the ceremony, Justin kissed his girlfriend, Disney starlet Selena Gomez, in what marked their first public display of affection.

The 'Baby' hitmaker has also spoken of his desire to perform with the brunette beauty in future.

He explained: "Maybe I'd sing with Selena, I've heard all of her new stuff it's amazing. I would also love to work with will.i.am as well as Jay-Z - on a cool fun record."