"OOOMMMGGG, I just realized that I hit 10 MILLION FOLLOWERS! Words can't even begin to express the love I feel for all of u," contactmuisc.com posted her tweet.
"I gotta do something special for u guys! Let me think of something fab to show my appreciation," she further posted.
Spears has joined the league following Katy Perry, Lady Gaga and Justin Bieber, Barack Obama and, most recently, Kim Kardashian.
Earlier, Colombian singer Shakira became the seventh most-popular person on the microblogging site, with nearly 7.42 million followers, her publicist announced on August 8.
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