Its like someone throws a grenade in the room.
Their lives gokersplat, Bergen tells EW.
Alicia Silverstone also stars in the comedy, which shot over a two-week period in Los Angeles.

Credit: Melinda Sue Gordon/Paramount
I jumped on board, says Bergen.
I was like the person hanging on the train, waving in the wind.
I just couldnt wait to do it.

Melinda Sue Gordon/Paramount
Every time she enters a room or even makes calls on the phone, its like shes General Schwarzkopf.
She has a waist the size of a teacup and this killer body.
She is defying everything.
Youre just ashamed of yourself when youre with her.
Book Clubwill hit theaters May 18.