Katy Perry is spilling the beans! During tonight's American Idol episode, the 35-year-old songstress shared her exciting and special pregnancy news with her co-stars, Lionel Richie and Luke Bryan. "Guys, I can't tell you how excited I am that we're going to have a fourth judge on this show," Richie cheekily said in a heartwarming video that was shared on YouTube on Sunday evening.