Choices:
Beyoncé & Lady Gaga - Telephone
Beyoncé & Shakira - Beautiful Liar
Britney & Miley - SMS (BANGERZ)
Rihanna & Britney - S&M Remix
Britney, Nicki & Ke$ha - Till The World Ends Remix
Demi & Cher - Really Don't Care
Rihanna & Nicki - Fly
Nicole & Rihanna - Winning Women
P!nk & Lily - True Love
Madonna & Nicki - I Don't Give A
Madonna & Nicki & M.I.A. - Gimme All Your Luvin'
Keri & Nicole - Scream
(sorry if I've missed any
)