Diego Boneta, Josh Henderson, Lucy Griffiths and more
Previously Seen: "Pretty Little Liars," "90210"
Expected Breakout Role: "Rock of Ages" (June 15)
Why: Boneta has gone from supporting roles in two minor TV series to landing one of the leading roles in Adam Shankman's big screen adaptation of the jukebox musical "Rock of Ages." Boneta will get to romance Julianne Hough and sing familiar songs such as "I Wanna Rock" and "Waiting for a Girl Like You." To say this is the biggest break of Boneta's career is the understatement of the summer.
- Gregory Ellwood