Using Perry's latest album "Witness" as reference, the official Twitter account posted: "Today, we #WITNESS history. Congratulations Katy Perry, the first to reach 100 million followers! #LoveKaty."
Twitter also posted congratulatory clip which previews some of Katy's top tweets over the years, reports aceshowbiz.com.
Indian fans BLAST international POP queen Katy Perry after she posts Goddess Kali’s pic to express her ‘current mood’!
Perry joined Twitter in 2009 and has been an active user since then. She reached 50 million followers by 2012. She is followed closely behind by singer Justin Bieber with 96.7 million followers and former US president Barack Obama with 90.8 million.
IN PICS: Orlando Bloom goes FULLY NUDE with girlfriend Katy Perry on a BEACH!