Gwen, of course.

Xtina, and it's a fact. Not many people outside of the US remember/know who Gwen is (as sad as it sounds), Christina Aguilera is known globally.

Gwen by far

Christina, and it's not even close.

Remember when Larry King asked for a signature of Christina Aguilera when it was Gwen Stefani. Oh well
Christina Aguilera.

Imho, I would have to say Gwen.

I mean No Doubt alone >>>