Keira Knightley will sing in a new movie while Adam Levine tries his hand at acting

New York  — For Keira Knightley and Adam Levine, their movie Begin Again is an experience of firsts.

Knightley, an accomplished actress, sings in the movie. And Levine, frontman of the band Maroon 5, acts.

Knightley recalls being "completely terrified" to sing. She spoke on the red carpet on Saturday where the film closed the Tribeca Film Festival.

Levine said he was "blown away" to be walking a red carpet for a movie role. He says he enjoyed the experience so much he might have caught the acting bug.

Begin Again is directed by John Carney, who was behind the successful musical drama Once. It also stars Mark Ruffalo, Hailee Steinfeld and Catherine Keener. CeeLo Green also has a small role.

The movie opens in the U.S. in July.

Watch the trailer here: