Isn't Calvin Harris performing at the pre-show? If so, we know who she's joining.
You're making no sense. It's allegedly her surprise performance, why would she join him? And the post clearly doesn't correlate with her own performance. She's bound to walk the red carpet.
It can be Calvin Harris, since Rih will be ft. on Calvin's album!
It's not a new song tho,it's wfl
Hoping it's Shakira,Katy or M.I.A
Rihanna and Katy collab has been long overdue!
Shakira there been rumors and they're both going to be at the Iheart Festival&Female Soccer World Cup&Both managed by Roc Nation
M.I.A because it wuld be amazing and they're both managed by Roc Nation
Can't wait
Like who could it possibly be? 
kelly would be amazing for me but impossible 