CONAN O’Brien has revealed how he caught Jennifer Aniston with her pants down!

The talk show host said he walked into Aniston dressing room backstage while she was putting clothes on in preparation for an appearance on Tuesday night’s Conan show.

“I’m pretty sure I knocked first… There was a moment there where I walked in on Jennifer Aniston, who had her pants about halfway up. It’s the greatest thing that ever happened to me,” Conan said.

“I even got a victory dance out of you… I loved it,” Jennifer responded.

Conan recently admitted his five-year-old son Beckett is especially critical of his comedy prowess.

“The boy is tough,” he said. “He’s five and the girl (Neve, 7) is more, ‘I love daddy, he’s so funny, ha ha ha.’

“She’ll just start laughing but the boy will just stare at me. I really start getting the flop sweat. Then I really dig in and I try. It’s actually a great exercise.”