A collection of memorable evening gowns worn by Diana, Princess of Wales, including one she wore to a White House dinner where she danced with John Travolta, fetched over £800,000 ($1.2 million) at a London auction Tuesday.

Diana famously wore the deep navy, figure-hugging velvet gown to a gala dinner hosted by President Ronald Reagan, during her and Prince Charles' first joint state visit to the U.S. in 1985. Photographs of her taking to the White House dance floor with Travolta have become some of the most celebrated images of the princess.

The Victor Edelstein gown was sold for $372,800, Kerry Taylor Auctions said. It came slightly below the expected maximum price of $400,000.

The auction house did not disclose the identity of the buyer, only saying it was sold to a "British gentleman as a surprise to cheer up his wife."

Nine other of Diana's dresses were sold to bidders, who came from around the world and included three museums, the auction house said.

Two dresses by Catherine Walker, one of Diana's favourite designers, went for $167,800 each. They were a black velvet and beaded gown worn for a Vanity Fair photo shoot by Mario Testino at Kensington Palace in 1997, and a burgundy crushed velvet gown the princess wore to the film premiere of Back to the Future in 1985.

Diana sold dozens of her dresses at a New York charity auction at the suggestion of her son, Prince William, in 1997 — three months before she died in a Paris car crash.

Florida-based socialite Maureen Dunkel bought about a dozen of the dresses — including the 10 to be sold next month — and put them up for auction in Canada in 2011, but the prices were set too high and many dresses didn't sell. The gowns had previously toured Canada.