Theres a special kind of joy in watching Tina Fey and Amy Poehler together.

It just wouldnt make sense playing sisters with anyone else, says Tina Fey.

LongtimeSNLand30 Rockwriter Paula Pell, wrote the screenplay which was inspired by her childhood diaries.

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Credit: RUVEN AFANADOR for EW

Mine would be like, I ate an entire pizza and masturbated and cried.

I didnt put that last part in.

Neither Tina or I have sisters in real life, Poehler says.

We are each others chosen sister.

Were 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.