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Rachel Bilson and Hayden Christensen couldn't make things work.

A source tells the new issue of Us Weekly (on stands now), that the Bilson and Christensen, both 29, have split -- again.

"They're done this time," a source says of the ultraprivate pair, who met in 2007 on the set of Jumper, got engaged in December 2008 and then called it off in August 2010.

"Engagement's over, relationship's over," the source adds. "She's really had it."