Christopher Guest and Jamie Lee Curtis attend the 95th Annual Academy Awards on Mar. 12, 2023 in Hollywood, Calif.Photo:Jeff Kravitz/FilmMagic

Christopher Guest and Jamie Lee Curtis attend the 95th Annual Academy Awards on March 12, 2023 in Hollywood, California.

Jeff Kravitz/FilmMagic

Jamie Lee Curtisknows how to keep a marriage alive!

The actress, 66, opened up aboutbeing married to Christopher Guestfor nearly 40 years during a Dec. 12 appearance on theTodayshow to promote her roles inThe StickyandThe Last Showgirl.

On the talk show, she opened up about the joy that Guest continues to bring to her life as they approach their 40th anniversary – which is on Wednesday, Dec. 18.

Jamie Lee Curtis at the 2024 CHLA Gala held at the L.A. Live Event Deck on Oct. 5, 2024 in Los Angeles.Alberto Rodriguez/Variety via Getty

jamie lee curtis los angeles 10 05 24

Alberto Rodriguez/Variety via Getty

Curtis shared that she is in disbelief over the longevity of her marriage, saying, “But look at me: I’m like the most immature — ask your crew, I’m like the most immature guest you’ve ever had. So how is it possible that I am married 40 years? I don’t understand it.”

Co-hostHoda Kotbthen asked her about what keeps them together.

“Do you guys just keep growing together? What is it?” Kotb asked Curtis.

“You know what, it is that,” the Oscar winner replied. “Ultimately, Chris wasn’t a director when I married him, I wasn’t a writer. Chris wasn’t a producer when I married him, I wasn’t a producer when he married me. We have grown into these new jobs that we’ve done.”

Curtis went on to describe how Guest enriches her life. “He still makes me laugh more than any human being and I’m sure there’s something about me that he likes,” she said.

The actress continued, “I don’t know what it is, but I’m sure it’s something.”

During a recent appearance onJimmy Kimmel Live, Curtis recounted meeting Guest after seeing his photo in a magazine. “I called his agent and left my number, he never called me. We ran into each other in a restaurant, he kind of went like this [waves], I went like this [waves], he called me the next day. We went out,” she said.

Actor Christopher Guest and actress Jamie Lee Curtis arrive at a Screening Of Netflix’s “Mascots” at the Linwood Dunn Theater on Oct. 5, 2016 in Los Angeles.Greg Doherty/Getty Images

Christopher Guest and actress Jamie Lee Curtis arrive at a Screening Of Netflix’s “Mascots”

The Emmy winnerwent on to say that she recently “found the receipt of when he went into Cartier to buy this very ring on my finger.”

“He was shootingSNLin New York and I was shooting the moviePerfect. I was on something called a payphone where you put quarters in and I remember we were speaking and I said, ‘What did you do today?’ " she said.

Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer​​, from celebrity news to compelling human interest stories.

Guest told her he “went for a walk” around the city and mentioned that he visited a Cartier store.

Curtis continued, “And then in typical boy fashion, ‘Do you like diamonds?’ Now, I’m telling the truth. So then he came out to Los Angeles and… Well, he proposed in a more private and intimate way.”

Her latest flickThe Last Showgirlhas a limited theatrical release on Friday, Dec. 13 and also starsPamela Anderson,Dave BautistaandBrenda Song.

source: people.com