Kathryn Hahn reveals that she and John C. Reilly improvised a plot to murder Adam Scott's character in 'Step Brothers.' ...

Kathryn Hahn completely improvised one of her most famous lines from "Step Brothers," she reveals to Jesse Tyler Ferguson.

Before her journey down Witches' Road as Marvel's Agatha Harkness, Kathryn Hahn memorably told John C. Reilly she wanted to ...

Agatha All Along star Kathryn Hahn recalled improvising a raunchy sex scene at the spur of the moment with John C. Reilly for the 2008 movie Step Brothers. The scene comes about midway into Adam ...

Kathryn Hahn and John C. Reilly in 'Step Brothers' "That whole scene when I tell him I'm gonna shove him in my vagina. Kids, I hope you're listening. That was all not really in the script," said ...

Kathryn Hahn and John C. Reilly in 'Step Brothers' "That whole scene when I tell him I'm gonna shove him in my vagina. Kids, I hope you're listening. That was all not really in the script," said Hahn, ...

Kathryn Hahn is revisiting some of the wildest improvisations that made it into Step Brothers — and some that didn’t. The Agatha All Along star, 51, was Jesse Tyler Ferguson’s latest guest on his ...

Related: Adam Scott tells Kathryn Hahn he felt like 'such an a--hole' scolding her in their Step Brothers car scene Several years on, and thanks to her role as Agatha in WandaVision and spin-off ...