Katy Perry at the premiere of "The Smurfs 2" at the Regency Village theatre in Los Angeles, on July 28, 2013.
Pop star Katy Perry narrowly eclipsed Justin Bieber as the most popular person on Twitter. Perry now boasts 46.48 million followers to Bieber’s 46.47 million. The unseating comes as Twitter prepares for its IPO, which could value the company at $13.9 billion.
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