The 'I Will Never Let You Down' hitmaker's DJ ex-boyfriend confirmed their break-up on twitter last week after an on/off year-long romance and the beauty has been enjoying the company of singer Khali Amir Sharieff, who was arrested alongside Justin for drag racing earlier this year.
A source told The Sun newspaper: ''Rita was a little mortified that Calvin tweeted about the split but she's just getting on with things.
''She has been with Khalil but who knows how long it will last?''
Calvin, who tweeted that the pair had gone their separate ways ''some time ago'' but wished her ''all the best'' in the future, was happy to be seen photographed leaving Hooray Henry's in Los Angeles with a group of ladies at the weekend, while Rita has been living at the new London celebrity haunt Chiltern Firehouse for the past few weeks.
The source added: ''A lot of things worked against her and Calvin, such as distance and hectic work schedule.
''And Rita is a self-admitted party girl. She likes to have fun and sometimes she can be hard to keep up with -- not that there's anything wrong with that.''
It has also been rumoured that Justin was the reason behind their break-up after she got close to him in the studio.
Meanwhile, Khali, who signed to Def Jam records in 2008, has insisted in the past that he's all about the music and doesn't want to get himself in trouble, despite his arrest.
He said: ''I'm not too much of a wild guy. I'm all about work, I'm all about studio. A lot of different things I do keep me stable.''
Rita, 23, and Calvin, 30, were last spotted together at Radio 1's Big Weekend in Glasgow where they both performed and Rita even watched from the side of the stage as Calvin took to the decks.
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