The couple met while filming the 1997 horror movie I Know What You Did Last Summer, but they didn't begin dating until 2000. After getting engaged in April 2001, they got married in Mexico on Sept. 1, 2002. The spouses -- who went on to costar in two Scooby-Doo films -- welcomed their first child, daughter Charlotte, in September 2009. Son Rocky was born in September 2012. "Freddie and I experience everything together and grow together," Gellar once told Cosmopolitan.