is a girl who makes no apologies for anything, least of all her recent collaboration with Chris Brown
, who she calls "dirty" in the best possible way. In a the new issue of Harper's Bazaar
(see the Rihanna
Harper's Bazaar cover here), she discusses teaming up with her ex on her song "Birthday Cake." "I thought it would be cute to do it with a guy. I wondered, who can be dirty, someone who people will ...