Rihanna refused to speak to Rita Ora at the Grammy Awards parties over the weekend.
The 'Diamonds' hitmaker 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 newspaper: "Rita and Rihanna were at the same parties all weekend.
"Rihanna deliberately kept her distance. She talked with Calvin at length but didn't acknowledge Rita.
Rinanna chatted with Calvin Harris at several Grammy awards parties, but reportedly refused to acknowledge girlfriend Rita Ora."It was awkward because they have the same management team and move in exactly the same circles.
"Rihanna's never been much of a fan of Rita because her style is so similar and they compete over songs."
Rihanna didn't attend the Grammy Awards at Los Angeles' Staples Center on Sunday (26.01.14) despite winning Best Urban Contemporary Album for 'Unapologetic' but later admitted she was thrilled to win the prize.
She tweeted: "$weet $urprise, pretty ph*cking rad! Thank you.(sic)"
Instead of attending the awards, Rihanna was spotted at The Young Money Cash Money Records party at Greystone Manor with rumoured boyfriend Drake instead.
And during that bash she will have likely been avoiding another rival, as Karrueche Tran was also in attendance.
Both Rihanna and the aspiring model have had on/off relationships with Chris Brown - who was convicted of assaulting the 'We Found Love' singer in 2009 - and had a war of words on twitter.
Tagged in Calvin Harris Rihanna Rita Ora