Who run the world? Girls! At least in regards to the Forbes list that counts down the Most Powerful Musicians in the year 2013, where Lady Gaga and Beyonce sit at No.1 and No.2, respectively.

We were rather surprised that Lady Gaga was in the top spot, especially with her hip injury that forced her to cancel her Born This Way Ball tour; but the calculations were done before the accident. Forbes shared that through January of this year, her tour grossed $168 million. Think, if she had finished her worldwide foray, Gaga would have posted profits of $200 million.

Coming in at No. 2 is Beyonce, who just extended her Mrs. Carter Show World Tour by 25 dates and grosses close to $2 million in every single city she plays, according to Forbes' estimation. No wonder she added shows to her tour, if the $2 mill a show is correct, she increased her profits by $50 million! If she and Jay-Z weren't billionaires already...

Rounding out the Top 3 and the Lady Pop Star Triumvirate is Madonna, who earned $125 million in the past year. How much do you think that's just residuals from all her hits? Madge, you could retire, homegirl!

Other pop stars on the list include Taylor Swift, Justin Bieber, J. Lo, Rihanna, Coldplay, Katy Perry and more. No wonder so many people want to follow careers in pop music -- there's some serious cash to be made!

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