Fields says that Day-Lewis has been a bad influence when they have been together at award ceremonies, reports contactmusic.com.
She told You magazine: "Daniel is an absolutely hysterically funny rascal. He always wants to do something funny and I'm always going, 'Daniel, we can't do that!' He's completely outrageous."
"We were together at the Screen Actors Guild Awards presenting on stage together and he's like, 'OK, let's do something stupid.' I'm going, 'No I'm trying to be dignified'," she further added.