Kieran Culkin has admitted he's the "naughty young actor" who once got Mark Ruffalo high during a play by replacing a prop ...

Where there's smoke...there just might be an angry stage manager.

Ruffalo told Graham Norton in 2012 that "a very naughty young actor" replaced his fake joint with a real one during a stage ...

Kieran Culkin has revealed himself as the “naughty young actor” who was responsible for getting Mark Ruffalo and other ...