David and Julia Koch hosted the oh-so-social Sapphire Ball, sponsored by Seaman Schepps, to benefit the Southampton Hospital. Wild and sexy Thelma Houston got the dance floor gyrating by performing her Grammy-winning hit, “Don’t Leave Me This Way.” Among the boogieing guests were George and Marianna Kaufman, Lally Weymouth, Ophelia and Bill Rudin, Tory and Christopher Burch, Vera Wang with Arthur Becker, Kathryn Cowles, Barbara and Alan Glatt, Ann and John Grimm, Dina Merrill and Ted Hartley, Gail and Carl Icahn, Mai and Ridgley Harrison, Virgil and Betty Sherrill.