Another Young Hollywood relationship bites the dust.

Joe Jonas and Ashley Greene have broken up, the New York Post reports. Dating since last summer, their relationship was initially the source of gossip as Jonas, 21, began dating Greene, 24, shortly after ending things with his friend and tour mate Demi Lovato.

The announcement of their "mutual and amicable" break up comes just as Jonas' Details cover story hits newsstands. Inside the issue, the third Jonas Brother divulged details about his relationship with Greene, praising her supportive nature. "I think what works about it is she really puts my feelings first," he said. "She understands my busy schedule. She'll fly out to my shows—she's been to places in South America that I can't even pronounce."

Luckily Jonas has plenty of things to keep him busy—he's currently working on his debut solo album, to be released this summer. But while his infamous cell phone break-up with Taylor Swift became songwriting gold for the country cutie, will Jonas mine his personal life for musical inspiration? Perhaps. "I think all artists have a right to write about what happens to them," he explained. "But, I have a right to write about things too." —EMILY EXTON