Katy Perry arrives at the 2012 Billboard Awards at the MGM Grand on Sunday, May 20, 2012 in Las Vegas, NV. (Photo by John Shearer/AP Images)

Jennifer Lopez arrives for the premiere of "What To Expect When You Are Expecting," May 14, 2012 at Grauman's Chinese Theatre in Hollywood, California. AFP PHOTO / ROBYN BECK

Actress Christina Hendricks arrives at the 64th Primetime Emmy Awards at the Nokia Theatre on Sunday, Sept. 23, 2012, in Los Angeles. (Photo by Matt Sayles/Invision/AP)

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Pictured: Emma Watson Mandatory Credit ?? Broadimage "The Perks Of Being A Wallflower" Premiere - 2012 Toronto International Film Festival 9/9/12, New York, New York, United States of America Broadimage Newswire Los Angeles 1+ (310) 301-1027 New York 1+ (646) 827-9134 sales@broadimage.com http://www.broadimage.com

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Actress Charlize Theron from South Africa poses for the media during a photo call for the movie 'Snow White And The Huntsman' in Berlin, Germany, Wednesday, May 16, 2012. (AP Photo/Michael Sohn)

Pictured: Jennifer Lopez Mandatory Credit ?? Joseph Gotfriedy/Broadimage "What To Expect When You're Expecting" - Los Angeles Premiere - Arrivals 5/14/12, Hollywood, California, United States of America Broadimage Newswire Los Angeles 1+ (310) 301-1027 New York 1+ (646) 827-9134 sales@broadimage.com http://www.broadimage.com