Spears Joins Twitter 10 Million Club

Joins the ranks of Lady Gaga, Justin Bieber and more.

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.