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16 January 2012, 11:30 | Updated: 16 January 2012, 11:32
The 'Born This Way' star thanks her fans in a message on the social-networking website.
Lady Gaga has passed 18 million followers on Twitter.
The 'Born This Way' star reached the milestone over the weekend and took to Twitter to say thank you to her fans.
She wrote: "Can't believe I have 18,000,000 TwitterMonsters, really rad, was just a few years ago I had barely any."
Lady Gaga is one of the most powerful celebrities on Twitter and currently has over six millions more followers than Rihanna.
Meanwhile, the 'Judas' star and Rihanna are both nominated for Best International Female at this year's BRIT Awards.
Lady Gaga is currently preparing her 'Born This Way' world tour, which is expected to take place later this year.