I love that they met on the movie set of “I Know What You Did Last Summer”!

Wow! Sarah Michelle Gellar and Freddie Prinze Jr. have been married for 18 years.

Gellar celebrated with a cute tribute on Instagram that included a photo from their wedding.

She captioned the picture saying, “You… are my favorite husband. #happyanniversary.”

The couple met in 1997 on the set of I Know What You Did Last Summer. They have two children; 10-year-old Charlotte Grace and 8-year-old Rocky James.

How long has your longest relationship lasted?  HA!  Don’t ask me that question!