Kevin Bacon and Kyra Sedgwick recently celebrated their 30th wedding anniversary, but the "City on a Hill" star won't be sharing the secret behind the Hollywood couple's long-lasting marriage anytime soon.

"There is no secret," the 60-year-old actor told Fox News during the Showtime portion of the Television Critics Association Winter Press Tour in Los Angeles on Thursday.

"In fact, I've often had a couple of different one-liners for that answer, and then I decided that really the answer is I'm not going to answer it because the last thing I want to do is come up with some quote that is going to summarize a 30-year relationship you know?" he explained.

"It's disrespectful to the relationship," Bacon added. "So I don't really know."

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Kevin Bacon and Kyra Sedgwick celebrated their 30th wedding anniversary back in September with a Bee Gees duet.

Kevin Bacon and Kyra Sedgwick celebrated their 30th wedding anniversary back in September with a Bee Gees duet. (Reuters)

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Back in September, the pair celebrated their anniversary with a sweet Bee Gees duet featuring Bacon and Sedgwick, 53, singing and playing the guitar along to the 1967 tune “To Love Somebody."

“30 years! I can’t believe it. @kyrasedgwick is the woman of my dreams and the music of my life,” Bacon captioned the video at the time, along with the hashtags “#tolovesomebody" and "#beegees.”

"City on a Hill" is set to premiere on Showtime on June 16 at 9 p.m. ET.