Matt Damon & Michael Douglas -- Prince Von Ahole Gushes About Naked Jacuzzi Time

Matt Damon and Michael Douglas getting naked in jacuzzi was a glorious occasion ... at least according to Prince von Ahole who can't stop gushing about the A-listers stripping down while filming "Behind the Candelabra" inside his digs.

As TMZ first reported, Zsa Zsa Gabor's hubby struck a deal with the people behind HBO's Liberace-themed movie to film in his mansion for a few weeks, in exchange for a $70,000 payday.

Now that the movie has aired -- and we've seen what went on behind closed doors -- our photog had to ask ... what was it like to have the celebs running around naked all the time?