Freddie Prinze Jr. and Sarah Michelle Gellar have been married for almost 20 years!

The two met on the set of 1997’s “I Know What You Did Last Summer.”

They started dating in 2000 and got married in 2002.

Prinze Jr. just revealed his secret to a long and happy marriage.

He said, “If you love and respect someone, what brings them joy should make you happy.”

He added that couples don’t necessarily need to partake in these activities together.

For example, he said he likes to unwind by playing video games ever since he was a kid.

Gellar credited good communication as the secret ingredient to a happy marriage.

“Listening is the most important thing,” she said.