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. (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."

An error occurred while retrieving the Instagram post. It might have been deleted.

“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.