Twenty-year-old Justin Bieber earned an estimated $80 million between June 2013 and June 2014, largely due to the last few months of his “Believe” tour.
Forbes continues to parse its annual Celebrity 100 list, this week ranking the highest-earning celebrities under 30. Only one in the top 10, Jennifer Lawrence, isn't a musician. The actress may topline the year's biggest box-office opener, "The Hunger Games: Mockingjay — Part 1," but it's Justin Bie...
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