"We Skype," Seyfried, 24, tells InStyle Hair on newsstands Friday about her U.K.-based beau. "It's boring, but it's true."
For the actress, who admits "there's nothing easy about" a long-distance relationship, and her Mamma Mia! costar-turned boyfriend, talking to each other with a webcam has become so ritual, "We don't even sit in front of the computer," she says.
"The other day, I was cleaning, he was cleaning," she recalls. "We couldnt see each other – we were just scrubbing away and talking like we were in the same room."
But when the two do want to get in some real face time, they hop on planes, though it's not always easy given their busy schedules.
"I worked hard in 2009, but it didn't seem that hard," she tells the magazine. "I spent two months in London with Dominic. I shot in Verona, Italy, [for Letters to Juliet]. I mean, how hard is that?"
So is Seyfriend a sucker for Cooper's English accent? "To be honest, I dont even notice it anymore," she says about her boyfriend of three years. "It was really sexy at first – and I still find it so attractive on other British men – but I've been with him now for so long, I dont hear it. He's like an extension of me."