British actress Keira Knightley is engaged to marry her rocker boyfriend James Righton. The Klaxons star cemented the couple’s 15-month relationship by asking the actress to be his wife – and she said yes. A spokesperson for Knightley. Actress Keira Knightley says she and James Righton have had an. said all is well in their relationship, reported Contactmusic. “Oh yeah, is it? We’re still together so it must have been…