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Cheek out Biebs!

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You’re not actually supposed to wear your birthday suit, Justin.

Justin Bieber kicked off his 19th-birthday celebration by wearing next to nothing as he hustled into his London hotel after a concert.

The shirtless heartthrob donned ridiculously saggy leather pants that left little to the imagination as he rushed back to his hotel to change after Thursday’s show in Birmingham.

“Great show!!! Now gonna go celebrate 19!! Thanks,” he tweeted after the performance.

Team Bieber said he was just in a hurry to get the party started for his birthday yesterday.

“He was coming off the stage and going to the hotel, and he was literally running in because he wanted to get changed and go right out,” his manager, Scooter Braun, told TV’s “Access Hollywood.”

He dashed off to a London club, where he partied until 5 a.m. with a posse of ladies before ending the night at a Lebanese restaurant, a source said.

The pop sensation was planning a circus-themed bash for last night in London, complete with clowns, the Daily Mail reported.

“Gonna be fun tonight,” Bieber tweeted yesterday. “Thanks to everyone for all the birthday wishes. 19!”