Camilla Belle arrives at the Metropolitan Museum of Art Costume Institute gala benefit, celebrating Elsa Schiaparelli and Miuccia Prada, Monday, May 7, 2012 in New York. (AP Photo/Evan Agostini)

Singer Rihanna arrives at the Metropolitan Museum of Art Costume Institute gala benefit, celebrating Elsa Schiaparelli and Miuccia Prada, Monday, May 7, 2012 in New York. (AP Photo/Evan Agostini)

Beyonce Knowles arrives at the Metropolitan Museum of Art Costume Institute gala benefit, celebrating Elsa Schiaparelli and Miuccia Prada, Monday, May 7, 2012 in New York. (AP Photo/Evan Agostini)

Beyonce Knowles arrives at the Metropolitan Museum of Art Costume Institute gala benefit, celebrating Elsa Schiaparelli and Miuccia Prada, Monday, May 7, 2012 in New York. (AP Photo/Evan Agostini)

Singer Rihanna arrives at the Metropolitan Museum of Art Costume Institute gala benefit, celebrating Elsa Schiaparelli and Miuccia Prada, Monday, May 7, 2012 in New York. (AP Photo/Evan Agostini)

Camilla Belle attends the Costume Institute Benefit at The Metropolitan Museum of Art May 7, 2012, celebrating the opening of Schiaparelli and Prada: Impossible Conversations. AFP PHOTO / TIMOTHY A. CLARY

Rihanna attends the Costume Institute Benefit at The Metropolitan Museum of Art May 7, 2012, celebrating the opening of Schiaparelli and Prada: Impossible Conversations. AFP PHOTO / TIMOTHY A. CLARY

Scarlett Johansson poses for photographs as she attends Marvel Avengers Assemble European Premiere at Vue Westfield in London, on April 19 2012. AFP PHOTO / JUSTIN TALLIS

U.S actress Scarlett Johansson arrives for the European Premiere of 'Marvel Avengers Assemble', at a west London cinema, ThursdaY, April 19, 2012. (AP Photo/Joel Ryan)

Scarlett Johansson 'Marvel Avengers Assemble' European film premiere at Vue cinema, Westfield London, England 19th April 2012 CAP/PL ??Phil Loftus/Capital Pictures

Scarlett Johansson 'Marvel Avengers Assemble' European film premiere at Vue cinema, Westfield London, England 19th April 2012 CAP/PL ??Phil Loftus/Capital Pictures

MAVRIXONLINE.COM - Scarlett Johansson at the European premiere of Marvel's "Avengers Assemble" held at Vue Westfield. London, UK. 19th April 2012. Byline, credit, TV usage, web usage or linkback must read MAVRIXONLINE.COM. Failure to byline correctly will incur double the agreed fee. Tel: +1 305 542 9275.

26 February 2012 - West Hollywood, California - Karolina Kurkova. 20th Annual Elton John Academy Awards Viewing Party held at West Hollywood Park. CAP/ADM/BP ??Byron Purvis/AdMedia/Capital Pictures

?AXELLE/BAUER-GRIFFIN.COM QVC Red Carpet Style Event. Four Seasons Hotel, Beverly Hills, CA. February 23, 2012. Job: 120223A1. www.bauergriffin.com www.bauergriffinonline.com Pictured: Stacy Keibler.

?AXELLE/BAUER-GRIFFIN.COM QVC Red Carpet Style Event. Four Seasons Hotel, Beverly Hills, CA. February 23, 2012. Job: 120223A1. www.bauergriffin.com www.bauergriffinonline.com Pictured: Stacy Keibler.

?AXELLE/BAUER-GRIFFIN.COM The 54th Annual GRAMMY Awards. Staples Center, Los Angeles, CA. February 12, 2012. Job: 120212A1. www.bauergriffin.com www.bauergriffinonline.com Pictured: Fergie.