I am not here for a collaboration with Cher, to be honest. Pink and Beyoncé are miles better.
I'm ok with Eminem for the male collab, I don't think it's true tho.
Look up the history on Cease Fire. Check the Producer, and their recent back catologue. Then check rumours dating back to August '11. Alas, she even mentioned him in a very recent interview. This is for the Male.
Female?
Adele? Lady Gaga? Shakira? P!nk? Beyoncé? Rihanna?