I hope the Collab is with Ke$ha, but im happy with RIhanna, it would be cool if the lead single was with RIhanna and another track was with Ke$ha, i dont think it is Rihanna too cause their track was produced by Darkchild and THIS collab was produced by dr luke, so i am thinking Ke$ha
oh and BTW's i am now officially a Katy Stan!!!!!!!!! for time stanning for two artist im PUMPED