Tom Selleck’s Wedding Almost Got Derailed After They Forgot the Marriage License — How the Minister Saved the Day (Exclusive)

"It was just an adventure. I wouldn't trade it," Selleck tells PEOPLE

<p>Alexander Tamargo/Getty</p> Jillie Mack (Left) and Tom Selleck (Right)

Alexander Tamargo/Getty

Jillie Mack (Left) and Tom Selleck (Right)

Tom Selleck's wedding to Jillie Mack, cementing their decades-long marriage, almost didn't happen.

The Blue Bloods star, 79, revealed in an exclusive conversation with PEOPLE that their Aug. 7, 1987 ceremony was almost derailed after they forgot their marriage license.

"She was in a little room off the little chapel, getting ready, and I think my mom was in there. Maybe Marty wasn't there. She was pregnant," recalls Selleck of the moments before seeing Mack, 66, walk down the aisle.

The actor says all he remembers is there suddenly being "this commotion."

<p>Ron Galella/Ron Galella Collection via Getty</p> Jillie Mack (Left) and Tom Selleck (Right) in 1986

Ron Galella/Ron Galella Collection via Getty

Jillie Mack (Left) and Tom Selleck (Right) in 1986

Related: Tom Selleck Reflects on His 'Lucky Life,' 'Accidental' Career and 4 Decades of Loving Wife Jillie (Exclusive)

"Jillie can talk really fast and a lot and loudly, and I heard all this stuff and I think Dan went to check, and we had all forgotten the license," he says.

The couple, who got married in a secret ceremony with only a handful of people in attendance at a wedding chapel near Lake Tahoe, Nevada, were only able to go through with it thanks to the reverend.

"That's what I remember most about the wedding. And Reverend David saying I'll sign the thing anyway," explains Selleck. "And he went all the way into Reno himself so we could have dinner and brought it back. So yeah, it was just an adventure. I wouldn't trade it."

Jeff Kravitz/FilmMagic Left to Right: Hannah Selleck, Tom Selleck and Jillie Mack
Jeff Kravitz/FilmMagic Left to Right: Hannah Selleck, Tom Selleck and Jillie Mack

Related: Who Is Tom Selleck's Wife? All About Jillie Mack

Of the wedding day decor, the Magnum P.I. alum says that the chapel had Astroturf, noting that the reverend and his wife "did everything they could to make it just right."

For more on Tom Selleck pick up the latest issue of PEOPLE on newsstands Friday.

Selleck credits Mack being a "very independent person" and having "her own life" as one reason behind their longstanding marriage.

"I don't think the relationship would've survived with somebody who was basically eating, sleeping, and working. And Jillie's a very active person, as you can see. And I remember the first time she stayed in Hawaii," he says. "I mean, she'd visit the set maybe late in the day, but only after she made my friend, Dave Muntz, take her to the roller skating rink so she could practice roller skating because she was going to audition to Starlight Express."

Tommaso Boddi/WireImage Tom Selleck (Left) and Jillie Mack (Right) in October 2017
Tommaso Boddi/WireImage Tom Selleck (Left) and Jillie Mack (Right) in October 2017

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The couple welcomed a daughter, Hannah Margaret Selleck, on Dec. 16, 1988, nearly a year after their marriage. Selleck is also the father of a son named Kevin, whom he adopted with his first wife, Jacqueline Ray.

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