Actors Keira Knightley and Mark Ruffalo have also been on a promotional tour for their new film, "Begin Again." We catch up with the pair at a special screening in London, where the stars reveal some of their secrets.

"Begin Again" sees Keira Knightley play Greta, an unsigned singer who gets dumped by her long-term boyfriend after he lands a deal with a major label in New York.

"Begin Again" sees Keira Knightley play Greta, an unsigned singer who gets dumped by her long-term boyfriend after he lands a deal with a major label in New York.

The 29-year-old actress married The Klaxons' James Righton in 2013, but admits that she doesn't know much about music. She adds that the secret to her marriage is that the couple doesn't know much about each other's job.

"No, no, I don't really know anything about music at all, so I'm a complete charlatan as far as this film goes cause everybody keeps saying 'So, you're doing this because you're obsessed by music?' and I was like 'No, I just liked the script.' " Keira Knightley said.

Mark Ruffalo plays Dan, a disgraced record-label exec, who stumbles upon Greta performing on an East Village stage and is immediately captivated by her. The actor has been filming the much anticipated "Avengers: The Age of Ultron" for the past few months across the globe. And since having kids, he's been going less and less to music gigs, but still finds the time.

"I shot a movie in New Orleans last year and we got to see a lot of great live music there and I'd go out and see any music there. It's all great music." Mark Ruffalo said.

And when asked about their break-up songs back in their younger years.

"'Bed's Too Big Without You' by The Police. It's true." Mark Ruffalo said.

"Yeah, there was a particular, I used to love 'Stand By Your Man' by Lenny Kravitz. I can remember that when I was about 16-17 having a big impact on my life." James Corden, Actor in "Begin again" said.

"Begin Again" opens in UK cinemas on July 11th. The film also stars Adam Levine, Hailee Steinfeld, Catherine Keener, and CeeLo Green.

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