Just in time for Halloween, I Know What You Did Last Summer turned 20.

Directed by Jim Gillespie, the classic slasher movie was a big break for many stars. For instance, Johnny Galecki, who played Max Neurick in the film, went on to star as Leonard Hofstadter in the hit series The Big Bang Theory, and Sarah Michelle Gellar, who played Helen Shivers, went on to play Buffy Summers in the popular TV series Buffy the Vampire Slayer. It was also a big film for stars Ryan Phillippe, Jennifer Love Hewitt and Freddie Prinze Jr..

Besides launching some of these stars' careers, the movie sparked a bit of romance. Prinze, who played Ray Bronson, ended up marrying Gellar in 2002. Although the two didn't play a couple in the movie, they went on a dinner date a few years after the movie debuted. The couple has been married for 15 years and has two kids. They also starred in the 2002 Scooby-Doo movie together as Fred and Daphne. 

"We were just friends. That's one of the reasons I think our relationship has always been so good," Prinze previously told E! News. "We were just friends for a good two years before we ever went on a date. She knew what kind of guy I was. She knew what my morals were, what my priorities were and vice versa. We already kind of knew all the faults in the other person."

He added, "We ended up being the perfect balance. But it didn't happen until years after and there was a solid foundation built, and that's probably the main reason why we've always been cool and groovy."

Back in April, Prinze couldn't believe it was almost the 20th anniversary of I Know What You Did Last Summer. He also talked to E! News about the film's legacy.

"I've always had passion for these movies," he said at the time. "Scream I think changed the genre and we were beneficiaries of that."

To see pictures of the I Know What You Did Last Summer stars then and now, check out the gallery.

Johnny Galecki, I Know What You Did Last Summer, 20th Anniversary

Columbia Pictures / Warner Bros.

Muse Watson, I Know What You Did Last Summer, 20th Anniversary

Columbia Pictures / CBS

Anne Heche, I Know What You Did Last Summer, 20th Anniversary

Columbia Pictures / NBC

Bridgette Wilson-Sampras, I Know What You Did Last Summer, 20th Anniversary

Columbia Pictures / Access Motion Pictures

Freddie Prinze Jr, I Know What You Did Last Summer, 20th Anniversary

Columbia Pictures / Getty Images

Ryan Phillippe, I Know What You Did Last Summer, 20th Anniversary

Columbia Pictures / USA Network

Sarah Michelle Gellar, I Know What You Did Last Summer, 20th Anniversary

Columbia Pictures / Getty Images for GILT

Jennifer Love Hewitt, I Know What You Did Last Summer, 20th Anniversary

Columbia Pictures / CBS

For those of you who haven't seen the movie, I Know What You Did Last Summer is about four teenagers who get in an accident and try to hide the victim's body by throwing it into the sea. However, their act comes back to haunt them one year later when one of the characters receives a note saying "I know what you did last summer." It soon becomes clear that someone is out for revenge.

The 1997 movie was such a hit that it led to two sequels I Still Know What You Did Last Summer and I'll Always Know What You Did Last Summer.

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