Justin Timberlake Hoped to 'Fall in Love' Working with Amanda Seyfried

By Jessica Wedemeyer

07/25/2011 at 09:55 AM EDT

Actors have been known to make unusual requests in their movie contracts, but when it came to working with Amanda Seyfried in his upcoming film In Time, Justin Timberlake had a romantic stipulation.

"I have a clause in my contract that says if you put someone as beautiful as Amanda in the movie, I have to fall in love with her," Timberlake joked at a press conference for the film at San Diego Comic-Con.

The costars bonded over a grueling shoot for the futuristic action film, which has Seyfried and Timberlake on the run after his character is accused of murder, and the duo eventually spent time together "shooting" off camera as well.

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"There are a lot of guns, which we both really enjoyed," Seyfriend said at a panel for the film. "We sometimes went shooting after hours."

While filming, Timberlake also bonded off set with another In Time costar, Olivia Wilde, who plays his mother.

"It was a mind trip for me," Timberlake, 30, responded when asked about the implications of having a beauty like Wilde, 27, play his mom. "Olivia is two or three years younger than me, so to have her playing my mother was definitely a head trip."

Added occasional SNL singer: "I'd just like to point out that [my song] "Mother Lover" is about sexing up someone else's mother."'
• With reporting by DAVID SCHLOW