Another one bites the dust. Singer Rita Ora, currently filming 'Fifty Shades of Grey,' and her DJ boyfriend, Calvin Harris, have split after nine months of dating.

Ora, who is probably better known for her fashion endorsements and her dating life than she is for her music in the U.S., unfollowed Harris, who is perhaps most musically known for his Rihanna collabo 'We Found Love,' on Instagram.

So Ora and Harris became Instagram unofficial. They have yet to formally comment, and there is no guarantee that they even will.

But a source said that their hectic schedules lead to the breakup. "It's been tough for both of them, but it's been even harder for them to spend time together recently," the insider said. He's got his lucrative DJ career, and she is in Canada shooting the erotic thriller. But it's not just a scheduling struggle that lead to the split.

The source said that they both have diametrically opposed approaches to fame. "Calvin is more private when it comes to fame than Rita, which also played a part," the source said. "He'd be happy to meet someone who has nothing to do with the industry."

Ora definitely likes hanging with models, and she's in the spotlight as a young pop star on the rise.

Ora and Harris famously battled on Twitter -- a row, to use a British term -- after she said she declined to record Cheryl Cole's 'Call My Name' and he called her a liar.

They clearly buried that hatchet and found love… but not in a hopeless place. Ora spoke about Harris back in the summer when she posed topless for GQ. She said she wasn't in love yet, but was falling at the time. Now she's falling (or has fallen) out of love.

Ora once famously dealt with some nasty Twitter accusations from her ex Rob Kardashian. Yeah, that was ugly.