On screen, they fall for each other passionately and send a flurry of love letters when they are torn apart.
But last night American star Channing Tatum had his hands full as he posed on the red carpet with his co-star Amanda Seyfried and his real life wife Jenna Dewan.
The pair can only communicate through letter writing and Tatum admitted that Dear John was the real life story of many service men and women around the world today.
The 12A-certificate film will be released in the UK on April 14.
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