Amal Alamuddin at her final fitting with Oscar de la Renta.

Kerry Washington arrives at the 44th NAACP Image Awards held at The Shrine Auditorium, Feb. 1, 2013, in Los Angeles.

Emma Watson attends the "Harry Potter And The Deathly Hallows Part 2" world premiere at Trafalgar Square, July 7, 2011, in London.

Jennifer Lawrence arrive at the 17th Annual Screen Actors Guild Awards at The Shrine Auditorium, Jan. 30, 2011 in Los Angeles, Calif.

Designer Oscar de la Renta and actress Penelope Cruz attend the "Alexander McQueen: Savage Beauty" Costume Institute Gala at The Metropolitan Museum of Art in New York, May 2, 2011.

Carrie Underwood arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena, May 20, 2012, in Las Vegas.

Jennifer Hudson attends the 79th Annual Academy Awards held at the Kodak Theatre, Feb. 25, 2007, in Hollywood, Calif.

Taylor Swift attends the "Charles James: Beyond Fashion" Costume Institute Gala at the Metropolitan Museum of Art, May 5, 2014, in New York.

Sarah Jessica Parker attends the "Charles James: Beyond Fashion" Costume Institute Gala at the Metropolitan Museum of Art, May 5, 2014, in New York.

Jessica Pare attend the 65th annual Primetime Emmy Awards at Nokia Theatre L.A. Live, Sept. 22, 2013 in Los Angeles, Calif.

Allison Williams attends the 2013 Winter Ball For Autism at the Metropolitan Museum of Art, Dec. 2, 2013, in New York.

Michelle Dockery arrives at the 71st Annual Golden Globe Awards at The Beverly Hilton Hotel, Jan. 12, 2014, in Beverly Hills, Calif.

Tina Fey speaks onstage during the 20th Annual Screen Actors Guild Awards at The Shrine Auditorium, Jan. 18, 2014, in Los Angeles.

Isla Fisher arrives at the 20th Annual Screen Actors Guild Awards at The Shrine Auditorium, Jan. 18, 2014, in Los Angeles, Calif.

Zooey Deschanel attends the Fox And FX's 2014 Golden Globe Awards Party, Jan. 12, 2014, in Beverly Hills, Calif.

ennifer Garner attends the Oscars held at Hollywood & Highland Center, March 2, 2014, in Hollywood, Calif.

Sandra Bullock attends the 76th Annual Academy Awards at the Kodak Theater, Feb. 29, 2004, in Hollywood, Calif.

Aubrey Plaza attends the 71st Annual Golden Globe Awards held at The Beverly Hilton Hotel, Jan. 12, 2014, Beverly Hills, Calif.

Amy Adams arrives at the Oscars at Hollywood & Highland Center on February 24, 2013 in Hollywood, Calif.

Oscar De La Renta, Elizabeth Nabel, First Lady Laura Bush, and Carolina Herrera are seen in this undated photo.

Oscar de la Renta and Oprah Winfrey attend the Costume Institute Gala Benefit to celebrate the opening of the "American Woman: Fashioning a National Identity" exhibition at The Metropolitan Museum of Art, May 8, 2010, in New York City.

Zooey Deschanel attends the 66th Annual Primetime Emmy Awards held at Nokia Theatre L.A. Live, Aug. 25, 2014, in Los Angeles.

Amy Adams arrives at the 85th Annual Academy Awards at Dolby Theatre, Feb. 24, 2013, in Hollywood, Calif.

Jessica Biel during The 79th Annual Academy Awards - Arrivals at Kodak Theatre in Hollywood, Calif., Feb. 25, 2007.

Cameron Diaz arrives at the 82nd Annual Academy Awards held at Kodak Theatre, March 7, 2010, in Hollywood, Calif.

Then first lady Hillary Rodham Clinton and then President Bill Clinton dancing at his 2nd term inaugural Arkansas Ball, Jan. 20, 1997.