He said: "We would sometimes speak French to each other on the set, especially when we didn't want anyone else to know what we were saying!"
However, the 33-year-old actress quickly grew tired of speaking in her native language because she felt it was affecting her acting.
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Cast member Johnny Depp arrives for a screening of "Public Enemies" in Chicago June 18, 2009. |
Johnny - who lives in the South of France with his long-term partner Vanessa Paradis and their two children, 10-year-old Lily-Rose and Jack, seven - praised his co-star for her acting skills and can understand why his character was attracted to Billie.
He said: "Marion really worked hard on that accent, and I think the way she speaks in the film adds so much to the personality of the character she plays. You can see why Dillinger fell in love with her so easily."
Although Johnny and Marion were happy to gossip off-screen, their co-star Christian Bale admits he was more reclusive.
He said: "I wish to not talk unless we're doing the scene. I enjoy it that way. Johnny seemed happy to do it that way, too. So the answer is, no, we really didn't get to know each other better between each take.
"So I guess I'll have to wait and get to know Johnny Depp someday."