Justin Bieber Kicks Off Wet and Wild 'Purpose' Tour With Sexy Dancing and Lots of Shirtlessness!

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Justin Bieber is back and just as shirtless as ever!

The 22-year-old GRAMMY winner kicked off his first tour in three years, the "Purpose World Tour," at Seattle's KeyArena on Wednesday and, never one to be shy about showing off his abs -- or you know, just getting completely naked -- Biebs provided his Beliebers with plenty of onstage shirtlessness.

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Bieber opened the show with his comeback anthem, "Mark My Words," and closed out the night with "Sorry," which he performed in a downpour of indoor rain -- hence the need to strip down onstage.

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The pop star, donning a Marilyn Manson T-shirt that said "Bigger Than Satan" on the back with "Bieber" written underneath, proved just how adult he is now, with sexy choreographed dance moves and plenty of grinding on his backup dancers.

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Here's that slick move in motion:

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And if rain and pyrotechnics and a giant glass box -- that's how Bieber made his big entrance -- weren't enough, he also brought out a trampoline at one point and showed off his acrobatic swag, flipping over the audience.

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Afterward, Bieber took to Twitter and simply wrote, "Thank you Seattle"

Meanwhile, ET caught up with Selena Gomez, who exclusively told us that she is "very happy" for Bieber's first GRAMMY win. Check out her reaction in the below video.