Justin Bieber: 'I've had a beer before'

Justin Bieber only turned 18 in March, but the pop star reveals that he has "had a beer before."

I mean, Ive had a beer, like, before," Bieber says in the June issue of GQ. "But I never get out of control.

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In the interview, writer Drew Magary is determined to take Bieber out for a night of drinking, gambling, or fighting -- something fitting for the star's new "adult" status. However, in the end, Magary had to settle for meeting Bieber briefly in the studio.

Bieber started out the night with several shows of bravado, yelling Im 18 years old and Im a swaggy adult! and later adding, Ive never made a bad song. But on the whole, Bieber kept his behavior calm and tempered.

Jen Lowery / Splash News

Justin Bieber admits that he has had a beer before.

"I keep my guard up a lot, because you know, you can't trust anyone in this business," Bieber explains. "That's what's sad. You can't trust anybody. I learned the hard way."

But there was one way in which Bieber did not seemed concerned about bucking his good boy image -- with his language.

"[Bleep] Platinum," Bieber says, when discussing car customization shops. "Platinum can suck a d--k, man. West Coast all day."

And upon leaving the studio for the night, Bieber sends off the group saying, "Good night, [bleeps]!"