Yes, he did. But it's not listed in the credits of the movie.
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If it's the movie I'm thinking of they sing Benny and the Jets and it's 27 Dresses with Katherine Heigal and James Marsden :)
etta James sing both blues and r & b soul
No, he did not actually sing in the movie.
Yes, she does sing in the song "Sugarhigh" from the movie Empire Records.
Actually none of the Jonas Brothers lip sync. They were taught by their father, who used to sing at churches. He taught them how to sing with their actual voices, but if you don't believe me buy a CD, and go to a concert. Then compare the differences.