Miley Cyrus turns 18th today! Miley was caught in a heavy makeout session at her birthday bash in L.A. Sunday night with her new beau, Avan Jogia.

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Us Magazine, clad in a black bra and leather pants, Cyrus leaned up against a banquette as teen star Avan Jogia seductively nuzzled her neck at Trousdale nightclub.

Besides smooching with her new beau, Cyrus was dancing the night away and hanging out with friends! The birthday girl and Ke$ha had a dance-off to Pink’s “Raise Your Glass” which brought everyone onto the dance floor.

But looks like the celebration is to continue for a while..

Miley says, “I have a birthday month.” “I do the whole month of November. Thanksgiving, cake — [it's] all about me on Thanksgiving!”

photos: Fame

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