Topic 4: Xtina's album will do better than Bionic
Topic 5: Brooklyn Carter, Dereonce
Topic 6: Ciara feat. Keri Hilson Beyonce feat (Adele or Prince)
Katy (feat. Wiz Khalifa)
Katy (feat. Rihanna)
Someone Lucky (Feat. Beyonce)
EDIT: I'd like to add Rihanna and Madonna
**** that's a good one. Wasn't it confirmed that they were going to work on a song together??