The point is to give Dr. Luke's artists, Britney Spears
AND Ke$ha, a shot at number one. Killing two birds with one stone. It also adds more interest to the song in general -- featuring Nicki Minaj
AND Ke$ha, looks better, intriguing. Not so much about the content so much as it is about the presentation -- three women headlining on one track aiming for number one.
...Vin