Britney Spears has joined Lady GaGa, Justin Bieber and the other Twitter.com high rollers after scoring 10 million followers last week (ends07Oct11).
Only six celebrities have reached the 10 million mark - Spears, Gaga, Bieber, Kim Kardashian, Katy Perry 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 2011.