Coincidentally, Perry hit her milestone the same morning President Trump tweeted about having "over 100 million people" following him.
Mashable questioned the authenticity of Perry's Twitter followers, claiming that bots, or fake accounts, are a common problem on Twitter. Meanwhile, singer Justin Bieber is not far behind with nearly 97 million followers. At that point, she reached 94.5 million followers. Justin Bieber is a close second with 96.7 million followers, and Taylor Swift, with whom Perry is rumored to be feuding, has 85.1 million followers.
Katy joined Twitter in 2009 and has been an active user since then.
Over the years, the songwriter has graced the social media platform with sweet - and sassy! - tweets.
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Perry recently released her latest album "Witness", and with it, has been moving toward what she has previously referred to as a more "socially conscious" kind of pop.
Her Witness tour in the USA and Canada kicks off on September 9 and runs through February 2018.
Katy Perry attends The Metropolitan Museum of Art's Costume Institute benefit gala, May 1, 2017, in NY.
As it turns out, Perry's reign as Twitter queen may be short lived as Justin Bieber is not far behind her with nearly 97 million followers.