Here's a look at 15 musicians and reality stars who REALLY should not quit their day jobs for these roles.
1. Beyoncé in Obsessed
3. DMX in Romeo Must Die
7. Kelly Rowland in Think Like a Man
8. La La Anthony in Think Like a Man
9. Rihanna in Battleship
10. Omarion in You Got Served
11. Kelly Clarkson in From Justin to Kelly
12. Christina Milian in Love Don't Cost A Thing
13. Britney Spears in Crossroads
14. Mariah Carey in Glitter
15. Cassie in Step Up 2: The Streets
StyleBlazers, whose bad acting really made you cringe?