Jlo didnt actually want all the publicity, That is part of why her and ben called it off. Well it wos the reason at first then he went and cheated on her. I dont think jlo really does things for publicity whereis britney everything she does just seems like its for publicity,She probably only done the song wih madonna for that reason, Cos people would be like "oh britney is doing a song with the queen of pop blah blah blah"