Britney Spears has joined Lady Gaga, Katy Perry and the other Twitter high rollers after scoring 10 million followers last week.
Only six celebrities have reached the 10 million mark - Spears, Gaga, Perry, Justin Bieber, Kim Kardashian and U.S. President Barack Obama.
Gaga leads the pack with almost 14.4 million followers - a million more than second placed Bieber.
Shakira, Taylor Swift and Rihanna are expected to reach 10 million followers by the end of the year.
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