6. LMFAO, “Lucky”
This is baffling to all of us.
7. Miike Snow, “Piece Of Me”
Miike Snow aka Bloodshy & Avant aka Christian Karlsson and Pontus Winnberg wrote and produced songs on a number of Spears’ albums, including Blackout, Circus and Femme Fatale.
8. R. Kelly, “Outrageous”
Like many singers who wrote a song for Spears, Kelly ended up doing backing vocals for the singer.
9. Robyn, “Piece Of Me”
Robyn sang the demo and Spears and crew ended up keeping her vocals in the background.
10. Sabi, “(Drop Dead) Beautiful”
This budding pop star was handpicked by Spears to appear on the track. The singer drops a verse in the song as well as provides backing vocals to the star herself.