Celebrity Fashion Face Off!

Mariah Carey wore a strapless Valentino dress the "American Idol" premiere event at Royce Hall on the campus of UCLA, Wednesday, Jan. 9, 2013, in Los Angeles. Jennifer Aniston was seen in the same dress at the 26th American Cinematheque Award Gala honoring Ben Stiller at The Beverly Hilton Hotel on Nov. 15, 2012 in Beverly Hills, Calif. (Matt Sayles/Invision/AP Photo; by Jeff Vespa/WireImage/Getty Images)