"Oh Em Gee! (oh my God). Just got the new Britney Spears song on iTunes hold it against me! It is my new jam! Obsessed! Can't quit dancing on set! Go check it!" Miley Cyrus, who is currently filming new movie SO UNDERCOVER, can't get enough of BRITNEY SPEARS' new track HOLD IT AGAINST ME, which broke U.S. radioplay records following its release on Monday (10Jan11).