VIDEO : Reese Witherspoon Apologizes to Taylor Swift and Katy Perry

Is there trouble brewing between Reese Witherspoon and Taylor Swift and Katy Perry? Not really?but the Oscar winner felt she needed to do some apologizing to the music superstars because she actually performs "Shake It Up" and "Firework" in the upcoming animated flick Sing. "I actually told both of them," Witherspoon said of Swift and Perry. I caught up with Witherspoon at the movie's premiere at the Toronto International Film Festival.