John Corbett, star of FX's new comedy Lucky, publicly broke the ice about his relationship with Bo Derek yesterday.

"We sort of made this pact with each other not to talk about it," Corbett said of his hush-hush relationship with '70s sex-siren Derek during a chat with ABC News Radio's Bill Diehl.

Corbett, 42, said that he started dating Derek, 46, a year ago after the pair were set up on a blind date.

"Man, oh, man. I think she's like a 10 and three-quarters. Actually, she's improved with age. She was just a kid when they did 10," he said.

Corbett said he and Derek have tried to stay out of the spotlight because they like to make fun of other celebrities that invite cameras into their homes.