Work by some of the biggest names in modern art went on show today ahead of a sale that is expected to raise more than £200 million.
More than 30 works, including a painting by Francis Bacon and an Andy Warhol print, have gone on show at Christie's in King Street, London, before they are transported to New York for the sale on May 12 and 13.
Among the stand-out lots is Bacon's Three Studies For A Portrait Of John Edwards which dates from 1984 and is valued at 80 million US Dollars (£47 million).
Brett Gorvy, the chairman and international head of post-war and contemporary art at Christie's, said it was one of the "greatest paintings" from Bacon's late period.
He said: "Three Studies For A Portrait Of John Edwards, executed in 1984, was the centrepiece of the artist's retrospective at the London Tate Gallery in 1985-86, and a work that the artist himself ranked amongst his best works. It shows an incredible tenderness and harmony that was prompted by Bacon's paternal relationship with the sitter, and this period of contentment elicited a confidence of style that has been compared to late Matisse."
Other works being offered for sale include a stainless steel cast train filled with Jim Beam bourbon by Jeff Koons, valued at 35,000,000 US Dollars (£20 million).