WHEN Geoffrey Bradfield throws a party, he puts P.T. Barnum to shame. To launch his new book, “Ex Arte,” the interior decorator took over the Versailles-like mansion at 60 E. 93rd (built in 1930 and now owned by antique dealers Carlton Hobbs and Stephanie Rinza). Bradfield body-painted two naked muscle men as peacocks (feathers front and center) and invited 300 bon vivants to swing on the chandeliers. Santo Domingo businessman/playboy Ramon Emilio Jimenez, a Bradfield client, hosted Pakistani heiress Uzma Khan, who flew in from Dubai, art dealers Ramis and Helena Barquet, Bradfield’s co-author Jorge Arango and publisher Paul Geiger, and “Baroness” Suzanne von Liebig (she has a 5-carat diamond on her finger and a two-bedroom Boeing on the runway). Later the sybarites repaired to club/eatery Bruno, where Rita Jammet treated everyone to a preview of her La Caravelle Champagne.