Miley Cyrus at Album Release Party: Kissing Mike Will Made It, Motorboating Amazon Ashley

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She spent weeks promoting it, fighting off critics and wearing very little clothing in the process... so Miley Cyrus made sure she had a blast last night during a party in honor of "Bangerz," which is now officially on sale.

According to Us Weekly sources, Miley showed off at a private affair in Manhattan around 12:45 a.m.

She essentially wore a pink bra and matching skirt to the shindig, which included a performance by ASAP Ferg and dancers dressed like bears and tigers.

Witnesses say Cyrus was escorted around the establishment by a security crew, but she found time to dance with producer/rumored boyfriend Mike Will Made It at one point. Hard.

"Miley was all over Mike Will Made it," an observer tells the magazine. "Grinding all over him, kissing his neck."

And Mike didn't mind, the friend adds, saying he responded with kisses of his own and some butt grabbing, perhaps putting to rest rumors that Cyrus is now dating Theo Wenner.

Throughout the evening, the 20-year old also danced with various women who were decked out in Las Vegas showgirl-inspired headdresses. She Twerked a bit, she made out with some unknown blonde friend and she generally did a lot of crazy Miley stuff.

Oh, and she also "motor-boated [Beachers' Madhouse performer] Amazon Ashley," according to a witness.

Cyrus closed her night with what sources describe as a "triple kiss" between herself, a female and a little person... and then finally left via Escalade around 5 a.m.

Sounds like a pretty fun night.

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Miley Cyrus Biography

Miley Cyrus Hair
Miley Cyrus has evolved tremendously over the years. Initially known for portraying Hannah Montana, the singer/actress made an effort to... More »
Franklin, Tennessee
Full Name
Destiny Hope Cyrus

Miley Cyrus Quotes

Thank you guys for all your support. Without you, none of this would be possible. I love every one of you and I could not be more appreciative. God bless you.

Miley Cyrus [at a concert, soon after photo scandal broke]

I have let myself down. I will learn from my mistakes and trust my support team. My family and my faith will guide me through my life's journey.

Miley Cyrus [on lewd photos]