Rihanna has revealed to Oprah that she still misses her ex-boyfriend Chris Brown.

The singer recently expressed concern about the man she called her "best friend," who attacked her three years ago.

"I'm reminded by a lot of things," the Barbadian pop star tells Oprah in the interview which is to be aired tomorrow (Sunday). "A lot of good memories we had," she declares, revealing that she is prompted to remember Chris "by the slightest things - hotel rooms, tour venues, any little thing, music, songs."

Rihanna's two-year relationship with Brown ended after he assaulted her the eve of the 2009 Grammy Awards. He was sentenced to five years probation and six months of community labour.