The children of legendary art dealer Ileana Sonnabend recently sold a collection of paintings and sculptures worth $600 million, in what may be the largest private art sale in history. Experts close to the sale say that GPS Partners bought $400 million worth of the collection, including Jeff Koons' Rabbit, Cy Twombly's Blue Room, and Roy Lichtenstein's Eddie Diptych, on behalf of numerous clients. Gagosian Gallery is said to have purchased the remaining $200 million of work — comprised entirely of Andy Warhols — although all involved parties declined comment.