New Line Cinema’s adaptation of Broadway’s hit musical ‘Rock of Ages’ is firming up its cast and it looks like Ryan Seacrest’s girlfriend ‘Dancing With The Stars’ Julianne Hough will co- star opposite Tom Cruise. Dancer, singer, actress Hough, who just got her movie feet wet in ‘Burlesque,’ will join Cruise and Mary J. Blige in Florida on May 19 when director/choreographer Adam Shankman starts filming. Said Shankman, “I asked her if she wanted to be in a movie with Tom Cruise and she wanted to not get on the plane so she could celebrate,” he said. “Her audition was surreal — maybe the best I’ve ever seen.” ‘Rock of Ages’ celebrates the rock hits of of the 80’s by Journey, Pat Benator, Joan Jett and Bon Jovi.