Sienna Miller talks about having a newborn, toddler and teenager, meeting Nicolas Cage during a screen test for National Treasure and John Krasinski writing the role of Agent Marlow for her in the film Jack Ryan: Ghost War. The Tonight Show Starring Jimmy Fallon. Stream now on Peacock: https://bit.ly/3gZJaNy Subscribe NOW to The Tonight Show Starring Jimmy Fallon: http://bit.ly/1nwT1aN Watch The Tonight Show Starring Jimmy Fallon Weeknights 11:35ET/10:35c Get more The Tonight Show Starring