The microblogging website's official account congratulated the pop diva by posting, "Today, we #WITNESS history. Congratulations @katyperry, the first to reach 100 million followers! #LoveKaty."
Perry followed up with a tweet, writing, "Thank you, @Twitter, for always giving me an opportunity to have a voice! #LoveKaty."
The 32-year-old singer posted her first-ever tweet in February 2009 and has since logged more than 8,000 tweets.
Justin Bieber is in the second spot with 96.7 million followers, while Barack Obama with 90.8 million followers, Taylor Swift with 85.1 million followers and Rihanna with 74.1 million followers are in third, fourth and fifth positions, respectively.
Today, we #WITNESS history.Twitter (@Twitter) June 16, 2017