The actresses tell PEOPLE about bonding on set over their sons Jessica Biel and Elizabeth Banks hadn’t worked together before The Better Sister, but the chemistry came easily between them. It was almost “weird,

The stars, appearing together on screen for the first time, talk about their new show, "The Better Sister," based on The New York Times bestselling novel.

Biel took the cast to see husband Justin Timberlake perform, while Banks took them dancing at a Manhattan club.