“American Idol� runner-up Katharine McPhee can count Tom Cruise and Katie Holmes among her McPhans. The couple is rumored to have asked her to sing at their upcoming wedding.

According to Contact Music, Holmes met McPhee when the singer visited the Los Angeles' Church of Scientology. Katharine was at the center to take some courses with her boyfriend and instantly hit it off with Katie upon meeting her. Since then, a source close to the couple says, "Tom and Katie have become Katharine's biggest fans. They think she's destined to become a singing legend." Cruise and Holmes have become so taken with McPhee - who is known for her resemblance to Holmes - that they have allegedly asked her to be their wedding singer.