Lindsay Lohan showed off her singing talents on Thursday (02Apr09) night when she joined British pop star Lily Allen on stage at her concert in Los Angeles for a cover of Britney Spears' hit single WOMANIZER. Lohan has become good friends with the SMILE hitmaker through her girlfriend, Dj Samantha Ronson and her producer brother Mark Ronson, who contributed to Allen's 2006 album, ALRIGHT, STILL.