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 Gomez Biography

Selena Gomez Red Carpet Pic
Selena Gomez is a Disney Channel star. She appears on the hit show Wizards of Waverly Place and is considered by many fans to be "the... More »
New York City
Full Name
Selena Marie Gomez

Selena Gomez Quotes

I'm not going to be a solo artist. I want to be in a band with four other guys.

Selena Gomez

I'm kind of lame. I prefer quiet evenings at home, hanging out with my family.

Selena Gomez