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20 June 2012, 08:17
The 'Where Have You Been' singer has sent a "big up" message to her fans after reaching the social milestone.
Rihanna has given a shout out to her 'Navi' after reaching a new milestone on Twitter this week.
The 'We Found Love' singer now has over 21 million followers on the popular social networking website, and welcomed fans to her official account earlier today.
"Just left rehearsal and my #Navi is DEEPAH!!!!!!! Big up wunna self!!!! Welcome to the #RihannaNAVi and thank u #21milliNavi," Rihanna tweeted today (20th June).
The 'Princess Of China' star arrived back in London earlier this week, tweeting fans with the simple messages: "I'm in LONDON b******sssss."
View a picture of Rihanna out in New York over the weekend below (Credit: Splash):
'Where Have You Been' singer Rihanna also spoke out about friends and pop peers Katy Perry and Cheryl Cole this week, describing them as "so hot it should be illegal", and saying that men better treat them well or "they are going to have me to deal with".
Rihanna arrived in London this week after a stay in New York City, where she was pictured out over the weekend wearing an all red outfit while dining out with friends.
Check out the full Twitter Rich List featuring Rihanna, Lady Gaga and Justin Bieber below: