Rihanna has "unfollowed" ex-boyfriend Chris Brown on Twitter.

The "You Da One" hitmaker - who was rushed to hospital suffering with "exhaustion and dehydration" on Tuesday night - has deleted the rapper from her social networking account after speculation emerged that a seemingly offensive song he released last night is aimed at the Bajan beauty. Chris - who also "unfollowed" Rihanna on Twitter following her actions - posted a link on the social networking site to his freestyle version of Kanye West's "Way to Cold," formerly known as "TheraFlu."

In the song, he raps, "Don't f**k with my old b*****s ... like a bad fur ... every industry n***** done had her... Trick or treat like a pumpkin ... just to smash her." Following speculation that the song is aimed at Rihanna, Chris tweeted, "Assumptions! I didn't say any names so if u took offense to it then its something you feel guilty about. (sic)"

(FYI - You can also follow VIP Breakdown on Twitter.)