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."

KYRA SEDGWICK ON BEING HUSBAND KEVIN BACON'S DISTANT COUSIN

Actors Kyra Sedgwick and Kevin Bacon arrive at the 16th annual Screen Actors Guild Awards in Los Angeles January 23, 2010.    REUTERS/Danny Moloshok     (FILM-SAGAWARDS/ARRIVALS) (UNITED STATES - Tags: ENTERTAINMENT) - GM1E61O0SCP01

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

KEVIN BACON REFUSES TO DANCE ALONG TO 'FOOTLOOSE' IN PUBLIC: 'I TEND TO AVOID IT' 

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.