A collection of gowns, accessories and keepsakes that belonged to Diana, Princess of Wales, is set to go under the hammer.The sale is billed as the most extensive collection of Diana's personal belongings since she sold dozens of dresses at a New York charity auction in 1997, according to Julien's Auctions.A pair of gowns sold during that auction, two months before her death, will top the sale at The Peninsula Beverly Hills in Los Angeles on June 27.A Murray Arbeid midnight blue tulle strapless

Princess Diana: What to know

Iconic Princess Diana outfits sells for eye-watering sum