MATT DAMON, MICHAEL DOUGLAS FILMING LIBERACE FILM

Prince von Ahole is about to get some incredibly famous house guests -- TMZ has learned he's renting out his Bel Air mansion for a movie starring Matt Damon and Michael Douglas.  Sources close to the Prince tell us ... Ahole and his wife Zsa Zsa Gabor struck a deal with the people behind Steven Soderbergh's upcoming project, "Behind the Candelabra" ... an HBO film about Liberace.