PHOTOS: Jessica Simpson is Ashlee's Biggest Fan

Jessica Simpson is her sister's biggest fan! Jessica attended yet another performance of her Ashlee Simpson-Wentz as Roxie Hart in Chicago on Broadway on Thursday in NYC. A theatergoer told OK!, "Jessica came out of the stage door a few minutes before Ashlee came out to greet the fans. I don't think she wants to steal Ashlee's thunder at her own show!" Ash signed autographs for fans afterward while her big sis smiled with pride!