Sarah Michelle Gellar Didn't Realize It Was the 20th Anniversary of 'Cruel Intentions'

Sarah Michelle Gellar completely forgot her 1999 cult classic film Cruel Intentions turned 20

Sarah Michelle Gellar may have missed the memo that it was the 20th anniversary of Cruel Intentions.

The 41-year-old actress, who starred as a vicious high school Queen Bee in the 1999 drama, shared her surprise on Instagram with a poster of the film featuring Ryan Phillippe, Reese Witherspoon and Selma Blair.

“Wait…today 20 years?!? I literally just realized today is the actual anniversary,” she wrote in the caption. “Well 20 years later I may be even more proud of this film.”

She continued, “Not very often do you get to be a part of cinema, that holds the test of time. @rogerkumbleyou are the most wonderfully disturbed person I know and I love you. @reesewitherspoon @selmablair@ryanphillippe (and not pictured @seanpthomas @vancityjax) you are even better actors and better people then you were then. Forget me- everybody loves this film and I intend to keep it that way. #cruelintentions #cruelinventions.”

Cruel Intentions centered on two vicious step-siblings, Sebastian and Kathryn of an elite Manhattan prep school. Kathryn (Gellar) bets Sebastian (Phillippe) to deflower the new headmaster’s daughter, Annette (Witherspoon) before the start of the term.

As Sebastian sets out to win the bet, he also ends up falling in love with Annette.

The film also stars Joshua Jackson and Christine Baranski.

Melissa Moseley/Columbia/Kobal/REX/Shutterstock

The success of the film has spawned an off-Broadway musical called Cruel Intentions: The ’90s Musical. To celebrate the anniversary of the classic, the producers announced an official cast recording in November.

Set for release on March 8, 2019, the album will feature a soundtrack of guilty pleasure pop hits from the last decade of the 20th century, all of which were used in the hilarious show.

The cult classic is also returning to theaters nationwide on March 22 for one week only.