If we go by numbers Oprah should be number one, but she didn't have as much media presence last year as Jennifer. As a celebrity, the later has had a very prolific renascence, from AI to having one of the biggest hits of 2011.
Justin may finally start gaining the media and general public
respect he needs and has been missing all these years. Rihanna is steadily becoming an actual force in music as she matures. It could be said Gaga is in the same place as last year with an insignificant decrease. Britney's story is almost the same a Jennifer w/o the TV presence. The list looks fair.
Little over a year ago everyone would be in fits of laughter if someone dared say J-Lo would make the top 50 of the Forbes list let alone #1.
And what about that A-lister's newest single? Radios are paying it dust, barely making 50M audience impression. 
