Actress Keira Knightley is set to add singer to her resume - after debuting her vocal talents on the soundtrack to new movie THE EDGE OF LOVE. The star, who appears in the forthcoming film, will perform three songs on the album, despite protestations from Knightley she isn't a good singer. She says, "I can't really sing. I had to have a few lessons, but once I started doing it, a sound emerged that wasn't too disagreeable."