According to People, the couple is currently not dating, but they possibly haven't called it quits for good.
U.S. & World
"Amanda and Dominic have been on and off for a while – and right now they're taking a break," a source told People. "But they're great friends and could still get back together."
The mag reported that Dominic was seen spending time with Amanda's "Mean Girls" co-star, Lindsay Lohan, while in Cannes this past week. He even reportedly had his arm around LiLo's waist.
As previously reported on AccessHollywood.com, the 24-year-old actress told InStyle Hair in this month's issue that distance was hard on her relationship with the 31-year-old British actor, explaining that they resorted to Web cams and a lot of time in the air in order to see each other.
"There's nothing easy about it," she told the mag of their three-year relationship. "We get on airplanes. You have to be willing to get on one, plain and simple."
The duo met while filming 2008's "Mamma Mia!"
When contacted by Access Hollywood, a rep for Amanda was not immediately available for comment.
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