Ariana Grande, who was previously the app's most popular woman, is now tied in second place.
Kylie Jenner has become the first woman to reach 300 million followers on Instagram.
Ariana Grande, who was previously the app's most popular woman, is now tied in second place with Selena Gomez.
They both have 289 million followers.
Manchester United striker Cristiano Ronaldo remains Instagram's most followed person, with more than 388 million followers.