Tina Fey and Amy Poehler who have been good friends since their SNL days play sisters in their newest film.

The comic duo is back together for the movie Sisters, which premiered on Tuesday evening. Fey and Poehler hit the New York red carpet in equally gorgeous sheer black numbers.

Amy Poehler & Tina Fey rock coordinating looks at the N.Y.C. premiere of #SistersMovie, and they looked incredible: https://t.co/EdsAy95D20

— InStyle (@InStyle) December 10, 2015

“Amy and I vow to make a movie every seven years until we make 100 movies,” Fey said, referring to their last project together “Baby Mama,” which came out in 2008. “Or we lose a pact with the devil and one of us ages,” Poehler quipped.

Sisters follows the lives of two sisters who hold a grand party one last time before selling their family home. Fey plays Kate, the wild child sister who wants to get her recently divorced sister Maura – played by Poehler – back in the dating game.

Tina Fey And Amy Poehler Play Sisters With Opposite Personalities

Tina Fey is also producing the movie, which is based on a script penned by SNL writer Paula Pell. “We all worked together at SNL for a long time,” Tina Fey shared during the premiere. “(Paula) would bring these old spiral notebooks that were her journals she found from the eighth or ninth or 10th grade, and they were hilarious. She was such a specific, sweet, nerdy child in her youth. The basis of her movie is her relationships with her sister, who was very different.”

Thanks to @thejoelstein for a sweet piece @TIME about me and my daughters I had with Lorne Michaels. #SistersMovie pic.twitter.com/oXwizF7RzV

— Paula Pell (@perlapell) November 20, 2015

Fey and Poehler became friends on the set of SNL more than a decade ago and have developed a “sisterly” bond after collaborating on several projects over the years. When asked about the secret behind their friendship, Tina Fey quickly said: “Every five years we go to a state park and we spend a week there naked.”

Tina Fey and Amy Poehler talk about their 20-year friendship in @glamourmag: https://t.co/Tiv3gOjVos pic.twitter.com/jwwUhxqNKk

— POPSUGAR (@POPSUGAR) December 1, 2015

“If we survive we’re still friends,” the 45-year-old actress added.

Starring alongside Tina Fey and Amy Poehler are wrestler John Cena, who plays a local drug dealer in the film, and more SNL ladies Rachel Dratch, Kate McKinnon, and Maya Rudolph. The movie is slated for release on December 18.