Gwyneth sings backup for Jay-Z

Gwyneth Paltrow and husband Chris Martin surprised the crowd at Jay-Z's London show last night by joining him on stage. The Coldplay singer worked on Jay-Z's new album and was expected to join the rapper in a live duet, but Paltrow's appearance was an unexpected thrill for the audience. The Oscar-winning actress sang backup for the Song Cry. Paltow and Martin were photographed with Jay-Z and his girlfriend Beyonce at the show's afterparty.