Britney for lick the ice with Rihanna

RIHANNA WAS ASKING ON HER TWITTER WITH WHO SHOULD COLLABORATE ON HER NEXT SINGLE "CAKE"; TWEET HER #RihannaBritneyCake:

@rihannaRihanna

Now here's the trick question! #IF I put collaborator on it, who would u wanna see lick the icing off?????#CAKE