The actress and comedian appeared on this week's episode of PEOPLE in the '90s podcast where she recalled attending Oscar parties with Madonna before their 1992 movie A League of Their Own came out.
"I would get out of her car with her, a limo, and everyone's going Madonna! Kathy Bates! Madonna! Kathy Bates!" O'Donnell, 59, said, remembering how people confused her for that year's Best Actress winner, Kathy Bates.
"We went to Spago and I sat next to Dennis Hopper," O'Donnell said. "And at the table was Jackie Collins' sister."
She continued, "Well, Dennis Hopper leaned over and said, 'I had sex with two women at this table. Start your guessing.' Oh my God, it happened that night. It was so wild."