John Stamos revealed a secret on Howard Stern’s SiriusXM radio show on Monday, that he got a girl pregnant when he was in his 20s but she got an abortion.

The Grandfathered star, 52, who very well could have been a grandfather by now if he kept the baby, said it just wasn’t the right time in his life to be a father.

“This was just bad timing,” he said. “It really wasn't my choice,” adding of the abortion, “I think it was sort of a mutual decision."

Stamos also talked about his DUI arrest, which inspired him to check into rehab and complete a stint this past summer, saying he was “embarrassed” about it.

"I could have hurt somebody. It was really stupid and ignorant of me and I hated myself for that," he said.

He went on to say Ambien was the real problem, in addition to drinking. "I'm so happy to be off that," he said. "[Ambien is] super dangerous. ... My memory was starting to get really f**ked up too from that. ... [It was] difficult to memorize scripts, I couldn't remember names and faces and things. That was the hardest thing to kick, by the way. Booze, that happened. Ambien was tough."