Rihanna seems to have had enough of her ex beau Chris Brown. The sexy songstress has officially "unfollowed" Brown on Twitter. Yikes!

Brown, who appears on a remix of Kanye West's "Way Too Cold" (formerly "Theraflu") track, sings:

    "Don't f**k with my old bit**es ... like a bad fur ... every industry n*gga done had her."

Right after the song was released, RiRi dropped him on the social network site. Brown goes on to sing, "Trick or treat like a pumpkin ... just to smash her."

Don't mess with RiRi!