Derek may have left DWTS, but we still have Julianne keeping Len company at the judges’ table. And she had a big announcement of her own. FOX will be joining the TV musical craze with a live performance of Grease. And playing Sandy will be Hough (Julianne, not Derek), while Rizzo will be portrayed by Vanessa Hudgens. Since Grease: Live isn’t taking place until January 31, 2016, it continues the longstanding FOX tradition of casting the roles of high school students with people a generation older.