Rihanna records track with ex Chris Brown

London: Rihanna has recorded a remix of her song ‘Birthday Cake’ with her former boyfriend Chris Brown, who assaulted her three years back.

Brown, who won a Grammy last week, has recorded both a singing verse and a rap verse.

“The feature on the remix is gonna shock the world,” the Sun quoted the song’s co-producers, Da Internz as saying.

This week Brown attended Rihanna’s early birthday celebration in Beverly Hills, sparking speculations that the two are in the process of rekindling their romance.