Sarah Michelle Gellar posts Instagram album to mark 15th wedding anniversary

Sept. 2 (UPI) -- Buffy the Vampire Slayer icon Sarah Michelle Gellar posted photos on Instagram to mark the 15th anniversary of her marriage to actor Freddie Prinze, Jr.

"My husband thinks I'm crazy, but I'm not the one who married me. #happyanniversary @realfreddieprinze 15 years!!" Gellar wrote alongside a slideshow of images from their relationship through the years.

Gellar, 40, and Prinze Jr., 41, co-starred in the movies I Know What You Did Last Summer, I Still Know What You Did Last Summer, Scooby-Doo and Scooby-Doo 2: Monsters Unleashed.

They have two children -- daughter Charlotte, 8, and son Rocky, 5.