Andy Warhol’s iconic sage-blue background portrait of Marilyn Monroe is tipped to sell for a record-breaking US$200 million at auction in the spring, Christie’s announced on Monday. The auction house said it expects Warhol’s 1964 Shot Sage Blue Marilyn to become the most expensive 20th century artwork when it goes under the hammer in New York in May. The silk-screen work is part of a group of Warhol portraits of Monroe that became known as the “Shot” series after a visitor to his Manhattan studio, known as “The Factory,” apparently fired a gun at them. In a statement, Christie’s described the 40 inch (100cm) by 40 inch portrait as “one of the rarest and most transcendent images in existence.” Alex Rotter, head of 20th and 21st century art at Christie’s, called the portrait “the most significant 20th-century painting to come to auction in a generation.” “Andy Warhol’s Marilyn is the absolute pinnacle of American Pop and the promise of the American Dream encapsulating optimism, fragility, celebrity and iconography all at once,” he said in a statement. Warhol began creating silkscreens of Monroe following the actress’s death from a drug overdose aged just 36 in August 1962. The pop artist produced five portraits of Monroe, all equal in size with different coloured backgrounds, in 1964. Chinese-Indonesian art fanatic ‘Budi’ Tek’s collection will live on According to pop-art folklore, four of them gained notoriety after a female performance artist by the name of Dorothy Podber asked Warhol if she could shoot a stack of the portraits. Warhol said yes, thinking that she meant photograph the works. Instead, she took out a gun and fired a bullet through the forehead of Monroe’s image. The story goes that the bullet pierced four of the five canvasses, with Warhol barring Podber from The Factory and later repairing the paintings – the “Shot” series. The Shot Sage Blue Marilyn portrait portrays her with a pink face, red lips, yellow hair and blue eye shadow set against a sage-blue backdrop. It was based on a promotional photograph of her for the 1953 movie Niagara directed by Henry Hathaway. At an unveiling at Christie’s headquarters in Manhattan, Rotter said the portrait stood alongside Sandro Botticelli’s Birth of Venus , Leonardo da Vinci’s Mona Lisa and Pablo Picasso’s Les Demoiselles d’Avignon as “categorically one of the greatest paintings of all time.” Only 14 paintings have sold for more than US$100 million at auction, according to an Agence France-Presse tally, although others are expected to have changed hands for as much during private sales. The most expensive 20th century artwork sold at auction is Picasso’s Women of Algiers , which fetched US$179.4 million in 2015. Mona Lisa copy sells for €2.9 million euros at Paris auction The auction record for a Warhol is the US$104.5 million paid for Silver Car Crash (Double Disaster) in 2013. In 1998, Sotheby’s sold the orange-shot Marilyn for US$17 million. Christie’s is selling the work, which will headline its spring sales week, on behalf of the Zurich-based Thomas and Doris Ammann Foundation. All proceeds of the sale will benefit the foundation, which works to improve the lives of children around the world.