Jennifer Lopez crosses the street to greet waiting fans as she arrives for the premiere of "What To Expect When You Are Expec
ROBYN BECK

Who do you think is the most powerful celebrity in the world? If you said anyone besides Jennifer Lopez, Forbes thinks you have another thing coming! The magazine released their annual World's Most Powerful Celebrities List, and Jennifer Lopez has been ruled more powerful than Oprah, Kim Kardashian, Tom Cruise and Steven Spielberg, not to mention plenty of other musicians.

Justin Bieber came in at No. 3, Rihanna at 4, Lady Gaga at 5, Britney Spears at 6, and Katy Perry at 8, meaning musicians make a stronger showing than celebrities in any other discipline. This is even stronger if you consider Kim Kardashian a musician.

Here's the way that Forbes decided that Jennifer Lopez is the most powerful celebrity on Earth, according to their website:

"We talk to industry insiders, including agents, lawyers, producers and other experts, to come up with an estimate for what each celebrity earned between May 1, 2011, and May 1, 2012. Online exposure is measured using Google blogs.

"Print media mentions come from [research information tool] Factiva, and we use [enhanced search engine] Lexis/Nexis to find out how many times each star was mentioned on television and on the radio. We comb through dozens of magazines from the past 12 months to count how many times each star appeared on covers. Twitter followers and Facebook fans are measured using Twitter and Facebook searches."

Forbes didn't count Barack Obama, who is definitely the most powerful celebrity in the world.

So do you think Jennifer Lopez is the most powerful celebrity in the world? Let us know in the comments!