The singer tops the microblogging site’s most popular list ahead of fellow pop stars Justin Bieber (18 million), Katy Perry (15.7 million) and Shakira (14.5 million).
Gaga’s massive following is in addition to 48 million fans on Facebook and more than 800,000 “circles” on Google+.
Unlike some other stars, the best-selling singer has said she personally updates her account