An unseen painting by Roman Kriheli is already stirring interest from celebrity collectors. Kriheli, whose fans include Lenny Kravitz, will unveil a portrait he calls “The Most Beautiful Woman in the World” within a month. But until then, he’s keeping the identity of the painting’s subject a secret. (Sources told Page Six it’s based on several ladies, including Dasha Zhukova.) Art writer Malcolm Harris reports that those inquiring about the work, which could fetch $1 million, so far include Mark Zuckerberg, YouTube mogul Chad Hurley and Georgian Prime Minister Bidzina Ivanishvili, who owns one of the world’s most valuable art collections.