Hailie Mathers is all grown up! The girl we once knew only through Eminem�s lyrics is now 15-years-old and gorgeous. We just discovered she�s joined the world of Twitter, where she�s constantly posting Twitpics of herself and tweeting little sayings about love. She even tweets back and forth with Hailee�s mom Kim, who was married to Eminem twice before they finally called it quits back in 2006.