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Rita Ora and Calvin Harris have called it quits.  The British DJ and producer took to Twitter on Friday to put the speculation to rest. 

He tweeted:

Rita and Calvin started dating last summer, and were last seen together back in April when Rita visited the U.S. to promote her single "I Will Never Let You Down."  Calvin wrote and produced the tune, as well as others on Rita's upcoming album, which is due out in September.  

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