After Christina Aguilera bought an original of Queen Victoria as a lesbian and two prints for £25,000, on 19 October 2006, a set of Kate Moss paintings sold in Sotheby's London for £50,400, setting an auction record for Banksy's work. The six silk-screen prints, featuring the model painted in the style of Andy Warhol's Marilyn Monroe pictures, sold for five times their estimated value. Their stencil of a green Mona Lisa with real paint dripping from her eyes sold for £57,600 at the same auction. In December, Journalist Max Foster coined the phrase, "the Banksy effect", to illustrate how interest in other street artists was growing on the back of Banksy's success.