He’s still got another three years to go before he’s legally allowed to drink in the US – but even that can’t stop Justin Bieber from raising the roof for his 18th birthday next month!

The pop cutie, who turns the big milestone on March 1, looks set to really let his hair down as he celebrates officially becoming a man!

“2 weeks until i turn 18. i grew up too. WE ARE GOING TO PARTY! Countdown," he tweeted this week.

And with a huge bunch of celebrity pals, including Usher, Lil Wayne and Kim Kardashian – we’re predicting it’ll be the b-day bash of the century!

Meanwhile, the chart-topper, who’s currently dating Selena Gomez, is clearly desperate to look his best for the big day.

“Worked out with the new trainer this morning,” he told his deihard Beliebers on Twitter.

“Hard work. We got goals. Gonna go hard.”

And it looks like JB will be rewarding himself with an early b-day pressie too!

Teasing fans about the release of his first single from his new album ‘Believe,’ he added on Twitter,

"In studio finishing this single. would write some of my lyrics here but dont want anymore people stealing them for songs. this be mine. Lol."

See more from Birthday boy Biebs in the video clip below…

2011 EMA - Main Show | Part 68 | Performance 9: ...

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