Rihanna refused to speak to Rita Ora at the Grammy Awards parties over the weekend, according to reports.

The Barbadian singer happily chatted to her rival's boyfriend Calvin Harris at several pre and post-ceremony bashes - including a brunch thrown by Jay Z's Roc Nation, which manages both their careers - but `deliberately` snubbed Rita because she `isn't a fan` of her.

A source told The Sun that Rihanna deliberately kept her distance. It was awkward because they have the same management team and move in exactly the same circles, the source said.

The source added that Rihanna has never been much of a fan of Ora because her style is so similar and they compete over songs.