Signs that things have come to an end between the affectionate couple came when the How We Do singer stopped following her DJ boyfriend on Instagram earlier this week.
Another hint followed when the 23-year-old posted a cryptic message on the image-sharing website: "Have you ever wondered which hurts the most: Saying something & not wishing you had not, or saying nothing and wishing you had?" wrote the blonde bombshell.
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A source told The Sun the split is down to the pair's busy schedules. "It's been tough for both of them but it's been even harder for them to spend time together recently.
"He's been busy DJing and she's working on her new album and shooting Fifty Shades of Grey.
"Calvin is more private when it comes to fame than Rita, which also played a part. He'd be happy to meet someone who has nothing to do with the industry."
Keeping up with her ever-busy schedule, Rita left Beverly Hills on Tuesday to begin filming the highly-anticipated screen adaptation of EL James' Fifty Shades of Grey.
She arrived in Vancouver, Canada on Wednesday, looking delighted to be there and wearing an animal-print oversized coat to fend off the cool temperatures.
Rita has been cast in the erotic film adaptation as Mia, the adopted sister of lead character Christian Grey, who will be played by Northern Irish actor Jamie Dornan.
The songstress broke the news of her move into film back in December, tweeting: "It's official! I've been cast in @FiftyShades of Grey as Christian's sister Mia. #FiftyShades."