Miley's 18th Birthday Bash An Adult Affair

11/23/2010 5:30 AM PST

Miley Cyrus' 18th Birthday Party -- An Adult Affair [VIDEO]

Today's Miley Cyrus' 18th birthday -- but she already got her adulthood on with an A-list only birthday party ... and some dude sucking on her neck.  Yeah ... they grow up so fast.

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