Being a double threat in Hollywood is nothing new -- tons of our fave actors have since released albums and had pretty sweet success doing it! But making the leap from singing to acting can be shocking to viewers. As Ashlee Simpson-Wentz learned the hard way when her role was cut from Melrose Place recently, acting just isn't for everyone. But who is it working for? We're counting down our fave singers who we think rock on the big screen!

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