The duo have sparked rumors they're dating after they were seen performing

some shopping along and hanging out at a concert, which are a few things that has reportedly left the 'I can ne'er let you Down' hitmaker - who dated the DJ till last year - fuming.
A supply told HollywoodLife.com: "She has hostility with Calvin and he does not have any fondness for her either.
"Rita is glad that he's not her drawback any longer and wishes them each the worst."
The 24-year-old singer is believed to have even gone as so much as sending a warning concerning Calvin to the 'Shake It Off' hitmaker through a mutual friend.

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