The 45-year-old actress, who is engaged to 'The Leftovers' star Justin Theroux, said she wasn't intimidated about working alongside Charlie Day, Jason Sudeikis and Jason Bateman on the film, reported Contactmusic.
"I have more balls than all of these guys combined. I worked hard on delivering those (raunchy) lines," she said.
As well as working hard, Jennifer also found some time to have fun on the movie set and the group used to try to get Bateman to laugh because he used to be good at keeping a straight face.
Asked who she thinks would be the best boss in real life, she said, "I think Bateman would be a great, great boss. He's straight and narrow, on point and honest. But he might be strict. He might get mad.