Since its founding 20 years ago, Beverly Hills-based auction house Julien's Auctions has specialized in Hollywood and celebrity memorabilia. Many significant pieces of celebrity history have changed hands there, including Marilyn Monroe's iconic "Happy Birthday Mr President" gown. In Juliens' upcoming "Legends: Hollywood and Royalty" auction on September 6-8, a trove of unique dresses, costumes and props worn by bold-faced names are headed under the hammer.
Related: The 6 Most Expensive Film Costumes Sold At Auction
One of the highlights is a dress worn by Audrey Hepburn in Breakfast at Tiffany's, estimated at $200,000-300,000. This pink silk organza dress has an extremely delicate and intricate finish, consisting of hundreds of hand-sewn floral lace appliqué embellished with rhinestones and sequins. The dress was designed by Hubert de Givenchy, who was a friend of the actress and worked with her for many years. Next to the little black dresses that Hepburn wore in the film, this pink dress is the most iconic. Almost all of the clothes Hepburn wore on the big screen were designed by Givenchy.

The auction also includes several dresses worn by Princess Diana, including a red evening dress estimated at $200,000-400,000. The red silk gown boasts a draped short sleeve bodice and ruching to the waist and hips with a lamé tartan motif.
Related: A Fashionable Friendship: Audrey Hepburn and Hubert de Givenchy

Related: Princess Diana's Iconic Black Sheep Sweater Goes to Auction
It is signed by British designer Bruce Oldfield, who worked with Princess Diana from her engagement throughout the 1980s. This particular red dress was worn several times by Princess Diana; she wore it for the last time while attending the film premiere of Hot Shots! in Leicester in November 1991.
Other Princess Diana highlights include two dresses designed by Catherine Walker, another one of Princess Diana's favorite designers.
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