Pop star Katy Perry has dethroned Justin Bieber as the most popular person on Twitter.com after racking up 46.51 million followers online.

The Roar hitmaker managed to edge out Bieber's 46.49 million on Monday (04Nov13) to claim the title, which he had held since January (13), when he toppled Lady Gaga with his then-33.3 million-strong collective.

Gaga now sits at three on the micro-blogging popularity list with 40.39 million followers, while Taylor Swift, Britney Spears, Rihanna and Justin Timberlake also feature in the new Twitter top 10.

Meanwhile, Gaga still reigns supreme on Facebook.com, where she boasts 60.35 million 'likes', eclipsing Perry's 59.25 million and Bieber's 57.27 million.