Miley Cyrus

Jeff Vespa/MC/

It's her party, and she'll show skin if she wants to!

Although Miley Cyruskept covered up during her performance at the American Music Awards Sunday night, we all know she can't be tamed for long.

She changed into a much more revealing two-piece leather getup for her private 18th birthday bash afterwards at Trousdale.

She's still 17 until Tuesday, but a slew of celebs joined her to celebrate adulthood—including one very affectionate mystery man:

Famous faces included John Mayer, Demi Moore, Ashton Kutcher, Ke$ha, Kelly Osbourne, Kyle Massey and fellow Disney star Avan Jogia. Miley's sister Brandi was there and her mom Tish—but dad Billy Ray was a no show.

"John [Mayer]'s presence was the buzz of the party, and he wished Miley a happy birthday," a party source tells E! News.

But forget John Mayer!

Miley Cyrus

Splash News

Check out the pictures of Miley getting in some serious PDA as a mystery man straddles her. The guy is reportedly Avan, but then again, one party source tells me the two were "just acting like friends" during her party.

Friendly indeed!

And if this is how Miley turns 18, we can only imagine her 21st birthday.

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