Justin Bieber, 18: “I’ve Had a Beer”

 Peggy Sirota/GQ

Even squeaky clean teen stars get curious.

In the June issue of GQ, 18-year-old Justin Bieber admits occasionally drinking alcohol, despite being underage. "For me, it's just like, I like to be in control of myself. I mean, I've had a beer, like, before. . . But I never get out of control."

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A large part of that decision stems from not wanting to disappoint his fans — or his tight-knit team. Scooter Braun, Bieber's manager, says the "Boyfriend" singer "knows that I hold him to a high standard. He doesn't want to blow it."

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

The Canadian pop star — who tells GQ he's "never made a bad song" — also defends reality star and longtime pal Kim Kardashian, 31, after a member of his entourage says the "bitch should never wear white in public again."

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"You guys are so mean, bro," Bieber tells his tour manager Allison Kaye. "People say she doesn't do anything; she actually does do stuff. She works hard."

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