Beyonce, 32
Miley Cyrus, 21
Taylor Swift, 23
Rihanna, 25
Lady Gaga, 27
Katy Perry, 29

Beyonce's Mrs. Carter Show tour has grossed more than $100 million since April. Cyrus' MTV Video Awards hoopla led to stellar first week sales of Bangerz (to the tune of 270,000 units) and a hotly anticipated 2014 world tour. Swift sold 1 million copies of her 2012 release Red in a single week, and then 3 million more. Rihanna saw six singles from her latest album, 2012's Unapologetic, reach No. 1. Gaga is promoting pop as art in the campaign for her latest album, Artpop, boosted by a hot Saturday Night Live host gig. And Perry's first single from her 2013 album, Prism, sold 3.9 million downloads, according to Nielsen SoundScan.