Leonardo DiCaprio pulled off a record-breaking art auction for charity with Christie’s on Monday that raked in $38.8 million. “The Great Gatsby” star had personally asked 33 artists — including Banksy, Julian Schnabel, Urs Fischer and Peter Beard — to donate or create new works for the auction, dubbed The 11th Hour. DiCaprio also donated a painting by Andreas Gursky from his own collection, and spent time at Christie’s phoning bidders to entice them in advance of the auction, sources said. Spotted at the sale (to benefit wildlife conservation through DiCaprio’s foundation) were Bradley Cooper, Mark Ruffalo, Tobey Maguire, Salma Hayek and François-Henri Pinault, whose family owns the auction house. The night’s biggest sale came after gallerist Larry Gagosian was locked in a bidding war with billionaire Vladimir Doronin, and spent $6.5 million for an abstract work by Mark Grotjahn, whom Gagosian represents. Pharmaceutical mogul Stewart Rahr — who we exclusively reported yesterday reached a $250 million divorce deal with his wife of 43 years — splashed out on works including a Robert Longo tiger drawing for $1.6 million and a portrait of his pal DiCaprio by Elizabeth Peyton for more than $1 million. The auction — which had been expected to bring in about $18 million — wound up setting record highs for 13 of the artists, and a source said it was “the biggest auction to benefit the environment ever.” DiCaprio bought a Takashi Murakami work for himself for $735,000. His “Gatsby” co-star Maguire shelled out $262,500 for a Sergej Jensen work. Anonymous donors kicked in $5.5 million to the overall tally. DiCaprio’s foundation has set its sights on saving tigers, sharks and rainforests, and many of the works for sale were animal or nature-themed.