U.S. actress Amanda Seyfried and her British boyfriend, actor Dominic Cooper, have broken up, a source told People.com.

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Seyfried, 24, and Cooper, 31, co-starred in the 2008 blockbuster movie musical "Mamma Mia!"

"Amanda and Dominic have been on and off for a while -- and right now they're taking a break," an insider told People.com.

"But they're great friends and could still get back together."