That one is debatable - I was just doing rough positions - but remember Shakira is huge across the Spanish-speaking world and also very famous in the rest of the world.

Britney Spears followed closely by Lady Gaga

Britney! DUH

Gaga, Britney, Beyonce.

Everyone and their mother and grandmother know who these three are. The others not so much.

1. Britney by far..
2. Gaga ushering in there as well, but not a full household name yet..

Britney..

What does that even mean. You either are or you aren't

Britney & Beyonce.

Obvious.

The one that's a well-established Pop Culture icon at this point.

I mean, I don't even use, but let's be real here. It's absolutely Britney.

Anyone who doesn't live under a rock knows them all.

Finally a poll result that is accurate.
Everyone knows Britney...all ages, races, even dogs whistle (ya''ll have seen the 'I wanna go' music video) so...