THE THOMAS CROWN AFFAIR star startled the funnyman when she "performed a Basic Instinct on him" and uncrossed her legs during the show - only to flash a fake rubber penis.
Leary says, "Rene Russo is a friend of mine and they said she was coming to roast me, and Rene is sitting there talking. She's in a nice dress and she uncrosses her legs and she's got a c***.
"She had a giant rubber penis and it was attached with testicles by a make-up guy. Talk about shock and awe. We couldn't believe it."