When these two met in the late 90's, Sarah Michelle Gellar was badass Buffy The Vampire Slayer on television, and Freddie Prinze Jr. was the hunky male lead in such 90's favorites as She's All That. The couple met on the set of the 1997 film I Know What You Did Last Summer, but didn't start dating until 2000. Unlike their 90's co-stars, Reese Witherspoon and Ryan Phillipe, Gellar and Prinze remain happily married. This year they celebrate 10 years of marriage and they welcome baby #2. Although both continue to work in Hollywood, she as an actress and he as a WWE producer and director, they remain very private as a couple and that might be one of their secrets to a successful marriage.