As she celebrates her birthday Tuesday, see how she went from a child star to bonafide sexpot
Though she's sold out concert arenas, Cyrus admits it can be hard to deal with criticism following her performances. "You can YouTube me, because half the comments are like, 'She sounds like crap!'" she told David Letterman in June 2010. "I'm like, 'At least I'm singing live, so take that.'"