Last week she hit Twitter confirming she and Calvin has called it quits on their year-long relationship, writing: "I don't usually address speculation but I've had an incredible time with Calvin, and I will treasure the memories.
"One of Rita's friends invited her to a house party and introduced her to Rich," the source spilled.
"They clicked straight away and Rita seemed to be hanging on his every word. After a while they slipped away from the rest of the party. The new-found friendship was all everyone was talking about."
Since Calvin and Reets threw in the relationship towel, the singer has been spotted out and about with her former "wifey" Cara Delevingne. The duo - who were previously attached at the hip - hadn't been seen together for an absolute age, suggesting that perhaps Calvin wasn't too keen on the supermodel.
LOVE RITA? See more from the songstress in the gallery below.