CASE OF THE EX: Rihanna Has No Regrets (PHOTOS)

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Rihanna is spotted leaving her London Hotel.

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Rihanna has been catching backlash like a mutha from collaborating with former flame Chris Brown on not one, but two songs last week, but RiRi doesn't have a regret in the world about the collaboration.

PHOTOS:Rihanna Strikes Back At Haters & Gets That Work In All Around London

We all know Rihanna is not one of the bashful celebrity tweeters, and since the drop of the records she's been throwing subliminal shots, rebutting naysayers and now expressing her feelings about the collaborations.

PHOTOS: Rihanna Goes Backless At Stella McCartney During LFW

Last night Rihanna took to her beloved Twitter page and send out the following tweets with the hashtag #NOREGRETS

Rihanna wasn't the only one who was up late night twitter loving, Chris Brown's girlfriend Karrueche also had some fun and posted a photo of her and a blonde friend with the caption "Blondes have more fun!"

Humm. We guess Chris likes his ladies blonde and tattooed.

Meanwhile, Rihanna is still running around London after celebrating her birthday there last week. Check out the photos of Rihanna leaving her London hotel early this morning.