Last week, Scottish DJ Calvin announced via Twitter that he and Rita ended their relationship "some time ago".
Reports also surfaced this week that Rita was unaware of Calvin's intentions to go public with their break-up.
However, Rita dismissed the rumours last night (11 June) in several messages posted to Twitter. She said: "I don't usually address speculation but I've had an incredible time with Calvin & I will treasure the memories. I've moved on from this topic so I hope people will respect that and do the same."
Rita's brief comment on the matter came just minutes after posting a photo of herself hanging out with close friend Cara Delevingne.
Hours later, Rita cryptically wrote: "Life can only be understood backwards but it must be lived forwards."
I don't usually address speculation but I've had an incredible time w Calvin,& i will treasure the memories— Rita Ora (@RitaOra) June 11, 2014
When Calvin announced his split from Rita last week, he said: "To address speculation - myself and Rita ended our relationship some time ago. She is a beautiful, talented woman & I wish her all the best."
Rita and Calvin have both spoken about each other in recent months. In April, Calvin gushed about Rita during a US interview, saying she "attracts quite a lot of attention".
"Right now, we see each other like four days every two weeks," he continued. "We'd probably get sick of each other if we had a whole month [together]."
Rita has also praised Calvin, who she collaborated with on her new chart-topping single, 'I Will Never Let You Down'.
"It's nice to work together," said Rita in a radio interview last month. "Honestly, I love working with him. He's such a good soul and he's so easy-going. He's just a proper lad, really down to earth."
Rita and Calvin were first linked together in May last year, but remained tight-lipped over their romance, initially refusing to comment on their relationship status.
After finally going public about their blossoming romance some weeks later, the pair seemed inseparable.
Despite facing split rumours earlier this year, Rita and Calvin showed they were very much together after making their red carpet debut at the Grammy Awards just two weeks later.
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Watch Rita's video for 'I Will Never Let You Down' below: