In terms of earnings, Gaga > P!nk >/= Britney > the rest. The BTW Ball will only serve to help prove this, as will the next tours for every pop artist.

lady gaga, shakira and beyonce

Gaga, Brit, and Tay

Taylor and Gaga. I don't know about the others, but Taylor and Gaga **** a lot.

Gaga - Bey - Taylor

I voted for GaGa...but seriously people give her touring way too much...her tour was the equal of Cher's Farawell Tour...it grossed over 200 million because she did over 200 dates

Gaga>Britney>Beyonce/Rihanna

Gaga, Beyonce, P!nk. If the Femme Fatale Tour had done better then Britney would be in P!nk's place.

Have ya'll even SEEN P!nk's average gross? It's ABYSMAL. She needed like a billion dates just to get on the list.

Lady Gaga, Beyoncé and P!nk.

P!nk, Lady Gaga, and Britney (although Britney not in MY opinion, but its pretty well accepted) put on the best live performances of those listed.

GaGa, Brit & Bey.

The day Nicki overshadows Britney (in any category in the world, that is) will be the day Rebecca Black gets a #1 smash hit.