Who Is the best singer out of these choices?

Rihanna American Navy

they all stink

obviously you are crazy if you think Rihanna is better than Christina A. Go get your ears checked. And Rihanna I just a wanna be Beyonce.

All of Them they are all my Idol

beyonce and alicia keys

christinaa <3

One direction

r u serious right now???

Christina!!!!!!!

Alicia Keys and Christina Aguilera because they don't need a lot of auto tone to make themselves sound better.

Christina :)

I like one direction

I'm sorry I didn't choose I didn't know which one to pick their all great