Photo by Jason Merritt, Getty ImagesMary-Kate Olsen at the Los Angeles premiere of The Hangover - 06/02/2009

Photo by Jamie McCarthy, WireImageMary-Kate Olsen at the 8th Annual Tribeca Film Festival Artists' Dinner - 04/23/2009

Photo by Jamie McCarthy, WireImageMary-Kate Olsen at the 8th Annual Tribeca Film Festival Artists' Dinner - 04/23/2009

Photo by Jim Spellman, WireImageMary-Kate Olsen at the 8th Annual Tribeca Film Festival premiere of Whatever Works - 04/22/2009

Photo by Jim Spellman, WireImageMary-Kate Olsen at the 8th Annual Tribeca Film Festival premiere of Whatever Works - 04/22/2009

Photo by Jason Merritt, Getty ImagesMary-Kate Olsen at the 24th Annual Film Independent's Spirit Awards - 02/21/2009

Photo by Frazer Harrison, Getty ImagesMary-Kate Olsen at Film Independent's 2009 Independent Spirit Awards in Santa Monica - 02/21/2009

Photo by Stephne Lovekin, Getty ImagesMary Kate Olsen at the New York Cinema Society screening of The Curious Case of Benjamin Button - 12/11/2008

Photo by Charles Eshelman, Film MagicMary Kate Olsen at the New York Cinema Society screening of The Curious Case of Benjamin Button - 12/11/2008

Photo by Jeffrey Mayer, WireImageMary-Kate Olsen at the Westwood book signing for "Influence" - 11/12/2008

Photo by Jim Spellman, WireImageMary-Kate Olsen and Ashley Olsen sign copies of "Influence" at Barnes & Noble Union Square - 10/28/2008

Photo by Dave M. Benett, Getty ImagesMary-Kate Olsen and Ashley Olsen attend a private party to celebrate the launch of Mary-Kate And Ashley Olsen's "Elizabeth and James" fashion line - 10/07/2008

Photo by Jamie McCarthy, WireImageMary-Kate Olsen at the New York City premiere of Wackness - 06/25/2008

Photo by Jamie McCarthy, WireImageMary-Kate Olsen at the New York City premiere of Wackness - 06/25/2008

Photo by Stephen Lovekin, Getty ImagesMary-Kate Olsen at the New York City premiere of Wackness - 06/25/2008

Photo by Jamie McCarthy, WireImageOlivia Thirlby and Mary-Kate Olsen at the New York City premiere of Wackness - 06/25/2008

Photo by Stephen Lovekin, Getty ImagesMary-Kate Olsen at the New York City premiere of Wackness - 06/25/2008

Photo by Stephen Lovekin, Getty ImagesMary-Kate Olsen arrives at the Metropolitan Museum of Art Costume Institute Gala, Superheroes: Fashion and Fantasy - 05/05/2008

Photo by Andrew H. Walker, Getty ImagesMary-Kate Olsen attends the New Yorkers for Children celebration of "New Year's in April: A Fool's Fete" - 04/16/2008

Photo by George Pimentel, WireImageMary-Kate Olsen at the 2008 Sundance Film Festival screening for The Wackness - 01/18/2008

Photo by Jim Spellman, WireImageMary-Kate Olsen arrives at the 7th on Sale Black-tie gala dinner - 11/15/2007

Photo by Mark Von Holden, WireImageMary-Kate Olsen posing at the Hampton SOCIAL - 08/11/2007

Photo by Vera Anderson, WireImageMary-Kate Olsen at the "Weeds" press conference at The Four Seasons Hotel in Beverly Hills - 08/01/2007

Photo by Ryan Born, WireImageMary-Kate Olsen attends the "Poiret: King of Fashion" Costume Institute Gala at The Metropolitan Museum of Art - 05/07/2007

Photo by Jean-Paul Aussenard, WireImageMary-Kate Olsen arrives at the Weeds Season 3 and Californication Premiere - 08/01/2007

Photo by Nick Harvey, WireImageMary-Kate Olsen attends the Phillips De Pury and Company and Taschen Party - 10/11/2007

Photo by Eamonn McCormack, WireImageMary-Kate Olsen attends the Martin Creed & Calvin Klein Spring/Summer 08 Party - 10/15/2007

Photo by Kevin Mazur, WireImageMary-Kate Olsen and Ashley Olsen at the InStyle and Warner Bros. 2007 Golden Globe After Party - 01/15/2007