Rihanna and Britney barely knew each other.... but made a remix to help S&M reach #1.
Rihanna latching onto to Kanye an randomly getting Paul McCartney on her 1st single.
Rihanna and Katy are "best buddies" for kiis, laughs and camera time at award shows.
Taylor..... well.... she's just Taylor with everybody.
Gaga is a desperate mess... no need to go there.
Beyoncé takes a CANDID pic with Katy Perry, on hwe way out of her dressing room, then suddenly hell breaks lose
Bey, ha power to get ATRL to fume