The actors are seen in a jolly mood, and Gyllenhaal has his arms wrapped around Hathaway for three different covers, reports dailymail.co.uk.
They also had a few steamy scenes in the film, and Hathaway says she "totally fell apart" the first time they were expected to take their clothes off.
She shared how director Edward Zwick took off his clothes as well and climbed into bed with both actors to lighten the mood while shooting the sex scenes.
But the actors gradually became used to nudity in the film, says Gyllenhaal.
"We were, like, having fake sex and being like, 'Knock the pot off, knock the pot off'. I was not focusing on her at all and instead focusing on knocking the pot off for Ed (the director)," he added.
Gyllenhaal, 29, and Hathaway, 28, play respectively a Viagra pharmaceutical sales representative and a free-spirited woman in the film.
According to Gyllenhaal, they were naked 65 percent of the time while shooting the project.
