Who's the Better Liar, Colin Firth or Emily Blunt?

Colin Firth and Emily Blunt create sparks in their new romantic dramedy caper Arthur Newman, and the lively Brit pair joke to ET Canada about how they didn't really get along when they first met, and who is the better liar! Plus, Emily talks about her upcoming movie with Tom Cruise, All You Need Is Kill, and Colin weighs in on another possible round of Bridget Jones!

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In theaters today, Arthur Newman stars Firth as Wallace Avery, a man tired of his life who decides to reinvent himself as Arthur Newman, a golf pro at a tiny country club. But his cross-country voyage of salvation is derailed by Michaela Fitzgerald (Blunt), who sees through Arthur's identity scam. But her own sordid past quickly comes to the surface and the two set out to reinvent themselves together.