Jon Kopaloff/FilmMagic Amanda Seyfried revealed the unusual way Channing Tatum pranked her on the set of Dear John. Seyfried, 40, and Tatum, 45, played lovers in the 2010 romantic war drama, based on Nicholas Sparks' 2006 novel of the same name, but the mood was much more lighthearted on set. In an interview with Deadline published on Thursday, January 15, the Oscar nominee was asked one of her favorite behind-the-scenes memories from her career and immediately recalled her dynamic with Tatum.