Justin Bieber "All Over" Selena Gomez at Celebrity-Based Birthday Bash

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Justin Bieber turned 18 years old on March 1, which means you can feel less dirty thinking of the singer in certain ways, ladies. But know this: he probably isn't thinking of you at all.

That's because the singer is clearly smitten with girlfriend Selena Gomez, as evidenced by his behavior at a surprise party thrown in his honor Friday night at the Beverly Wilshire Hotel.

"He was all over Selena the whole time, walking her around by the hand. He kept kissing her," an onlooker tells Us Weekly. "It's clear she was the best part of the night for him. He is still so in love with her."

Justin Bieber and Selena Gomez Photograph

Also in attendance at the shindig: Justin's mom and grandparents; his manager (who presented him with a new car last week); Kim Kardashian, Kylie Jenner, Kendall Jenner, Ashley Tisdale, Cody Simpson and... Mike Tyson, among other stars.

A the Twit pic above proves, however, Justin only had eyes - and lips - for one attendee.

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Selena and Justin are so cute together I hope that they last and get married! So cute!

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Gosh dis pics Look Beautiful,Wonderful and Down 2Earth.I wish them luck in these relationship.

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So cute!!!

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Why did those "KARDASHIAN HOES" HAVE TO BE @ HIS PARTY?? Kinda makes it "TAINTED WITH FREAKS"!!! EWWWWW YUCK!! I HOPE SHE DIDN'T KISS THE BEIB......

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Donnab...........It's Justin's boyfriend!

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I don't think he's a virgin anymore. Also, any tweenagers who think they have a shot at him, sorry but to tell you the truth, just look at the picture and figure it out. If for some reason you don't comprehend that, it means he's already taken.

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Woooo what !? beutiflay

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@PeerTree well duh u think he is s virgin I dont

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they are totally fucking.

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Who's the creepy guy watching them? If he got any closer he would be in the same dress as Selena. I love the two of them together they are adorable. I hope they can go the distance.