Have a look at these:
Black Eyed Peas ft. George W. Bush - My Slump:
http://www.youtube.com/watch?v=Vzxky8TqkU4
Destiny's Child - Beyoncé:
http://www.youtube.com/watch?v=aASCZgbJxC8
Britney Spears featuring Madonna - Me Against Madonna:
http://www.youtube.com/watch?v=gvlqm-wom-E
I have another one but it is a bit too rude to post on TiBB
