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"They broke up recently," a source adds. "It just didn't work out."
Barton, 22, has been linked with Locke, the guitarist for Rooney, since the winter. Since they began dating, the former O.C. star has cheered on her beau from the audience and backstage at his band's gigs. In April, Barton traveled to Ireland, following Locke on tour through Europe.
The couple was most recently spotted out in August, taking in jazz night at the Green Door, a Hollywood lounge, where the duo "snuggled up on the couch with all their friends."
Rooney most recently completed a world tour, and Barton is set to launch her own line of hair accessories.
Barton's rep was not immediately available for comment.
• Reporting by MARISA LAUDADIO
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