Singer Justin Bieber reportedly led to singer Rita Ora's split from her boyfriend Calvin Harris after the "Baby" hitmaker started getting cosy with Ora in a recording studio a few months ago.

Bieber triggered the end of the couple's relationship after he became "affectionate" with the 23-year-old singer, reports femalefirst.co.uk.

"Word got back to Calvin, Justin and Rita got touchy-feely with each other while they were in the recording studio together over the last few months. Calvin heard they were very affectionate -- she would sit on his lap (and) he would rub her back," said a source.

Ora had moved in with Harris, who produced her new track "I will never let you down", here, but he's now had her belongings removed from his house.

"He's already had her things removed from his LA (Los Angeles) house ... he (also) produced a few songs for her, but now he won't allow their release," said the source.

Harris tweeted June 6 night that he and Ora, whom he begun dating in May 2013, had separated "some time ago", but he wishes her "all the best" in the future.