Miley Cyrus turned 17 yesterday, and she reportedly celebrated last week with a surprise ’80s-themed party at New York City’s Canal Room that featured a performance by the cast of the Broadway show Rock of Ages and an elaborate cake designed by Buddy Valastro, the star of TLC’s Cake Boss, according to People magazine. “They didn't want a girly girl cake,” Valastro tells the magazine. For the party, Cyrus reportedly dressed as Julia Roberts’ character from Pretty Woman.