By Sara Vilkomerson
October 28, 2015 at 12:00 PM EDT

There’s a special kind of joy in watching Tina Fey and Amy Poehler together. It doesn’t matter if it’s side by side on Saturday Night Live, or at the podium of the Golden Globes or — in the case of EW’s photo shoot — if they’re wrapped together in Christmas lights with fake snow falling overhead. It’s an enviable two-decades plus friendship that makes for a believable onscreen blood-bond in Sisters (in theaters Dec. 18), the raucous comedy directed by Jason Moore (Pitch Perfect) about a pair of siblings who throw a blowout house party to end all parties (and houses) after they discover their parents plan to sell their childhood home. “It just wouldn’t make sense playing sisters with anyone else,” says Tina Fey.

Longtime SNL and 30 Rock writer Paula Pell, wrote the screenplay which was inspired by her childhood diaries. “My sister is three years older and super foxy and I always looked like a 50 year old woman,” Pell says. “Her journals were like, ‘Oh my god, I made out with Bill under the stars in the back yard. ’ Mine would be like, ‘I ate an entire pizza and masturbated and cried.’ — I didn’t put that last part in.” 

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Fey signed on to produce and star as Kate, a former wild child unhappy in her personal and professional life. For the role of Maura, the ultra-responsible and recently divorced do-gooder sister who chooses to let loose (really loose) during the party, Amy Poehler was a natural choice. “Neither Tina or I have sisters in real life,” Poehler says. “We are each other’s chosen sister. We’re kind of like sisters and our parents are show business. We call each other to complain about how mom and dad have treated us at Thanksgiving.”

In this week’s issue, Fey and Poehler give us more of a peek into Sisters which kicks off our annual Holiday Movie Preview. Pick up the issue, on stands this Friday, for interviews with Tom Hardy, Gwendoline Christie, David O. Russell, Cate Blanchett, and a closer look at some of this holiday’s most anticipated films including Star Wars, The Danish Girl, Joy, The Revenant, Concussion, Point Break, Carol and more. 

To continue reading more on EW’s Holiday Movie Preview, pick up the new issue of Entertainment Weekly, on newsstands Friday, or buy it here