The pair have gone public with their romance, stepping out at a playback of Daft Punk's new album up the top of The Shard in London on Monday.
The walked hand-in-hand as they were escorted inside the venue by security, with Rita looking gorgeous in a casual outfit and minimal make-up.
Rita and Calvin were first linked last month when they were seen leaving LA's Chateau Marmont together.
However, the couple weren't always on such good terms, as last year Rita claimed she had turned down the chance to record the Calvin-penned Cheryl Cole hit 'Call My Name'.
But an unimpressed Calvin took to Twitter to deny her claims, saying: "She made that up."
She was also linked to 'X Factor' winner James Arthur earlier this year, and is of course 'wifey' to model Cara Delevingne.