Singer's eighth studio record believed to be due on Friday (November 27)
Singer is believed to be close to finishing her eighth studio album
Pop star was expected to perform at event next week
The violence of 'Bitch Better Have My Money' has been compared to Quentin Tarantino films
Consumer tech titan want Rihanna to help promote Galaxy products
"It's the thing that makes me want to prove people wrong," says the singer.
No release date given for singer's eighth album
Brown was convicted of assaulting the star in 2009
Singer defends the 'transracial' activist who made headlines after pretending to be black
Pop singer tells NME she does not think a live collaboration would be a good match