Jennifer Lopez (No. 1) is the World’s Most Powerful Celebrity on Forbes’ 2012 list of the 100 most influential people in entertainment – ranked by earnings, press coverage and Internet impact. Lopez catapulted from No. 50 last year to No. 1, her first time atop the list. Her colleague, American Idol host Ryan Seacrest, is No. 29. Lopez unseated Lady Gaga (No. 5) who topped the list last year.