Katherine, we hardly knew 'ye! Tom Cruise and Katie Holmes have supposedly asked "American Idol" runner-up Katharine McPhee to sing at their wedding. McPhee was said to have met the star-powered couple during a visit to the Church of Scientology in Los Angeles. The Magic Morning Show reports that she has been attending classes there with her boyfriend, and goes on to quote someone saying: "Tom and Katie have become Katharine's biggest fans. They think she's destined to become a singing legend." Don't take any antidepressants, if it doesn't work out, though. Tom wouldn't like that.