MIley Cyrus Locks Lips with Britney's BackUp Dancer: Watch Here!
On Saturday, the "Wrecking Ball" singer checked out opening night of the pop princess's stint, singing and dancing along to the hits from the front row.
Later, the 21-year-old got caught up in the music and began grinding on one of the female dancers. Another approaches and the former Disney darling plants a big one on her before returning to her seat.
Of course, this was all captured on amateur video. Check out Miley's latest eyebrow-raising behavior in the player below.