Don't Miss:

Zoe Saldana Sings for Nina: More Actresses as Famous Singers!

Reese Witherspoon as June Carter Cash

"I have extreme anxiety in front of crowds, and I have to sing onstage in this new Johnny Cash movie, Walk the Line, with Joaquin Phoenix," the actress told us in our October 2004 cover story. "I sweat in places I didn't know you can sweat. But the thing is, nervousness is sometimes a good thing. It pushes you forward." And it did—all the way to Oscar gold for her performance.