All hail the new ruler of Twitter, Katy Perry. Perhaps riding a wave of momentum from the release of her new album, Prism, she has become the most-followed person on the social media site, surpassing Justin Bieber.

As of 6:00 a.m. ET  Monday, Katy had 46,516,905 followers, ahead of Justin's mark of 46,498,703.

That's a pretty narrow gap between the two, and Justin is helping his cause with his "Music Mondays" program, which he promotes heavily on Twitter. He just released his latest tune, "Bad Day," this morning.  Justin is releasing a new song every week until December 16.

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