Selena Gomez was previously the number two most-followed celebrity on Instagram, and the most-followed woman on the platform.
Gomez was Instagram's most followed user up until the end of October when football star, Cristiano Ronaldo took her top spot.
The Rock, Kim Kardashian West, Kylie Jenner, Beyonce, and Talyor Swift make up the top 10.
The "Wolves" singer also claimed she doesn't "have the damn app on my phone", so doesn't understand how she has so many followers - or why people care. As of now, Grande has 146,335,231 followers, while Gomez has 146,288,236 followers on Instagram.
The 25-year-old communicates with her army of fans on Instagram and Twitter, using the platforms to promote her latest music. On the other hand, Grande has more posts and stories than Gomez.
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Even after her social media comeback, Gomez has made a conscious decision to post very rarely on her account.
Can Selena get her crown back?
Grande takes periodic breaks from social media, but typically she's posting daily.
"Manchester babes, i'm so thrilled to be headlining pride.my heart".
Ariana Grande is already having one hell of a record-breaking year, and it's only February. 'My heart. I cant wait to see u and i love u so so much'.
The singer will headline the 2019 Manchester Pride Festival, which takes place between August 23 and August 26. She hasn't performed in the city since a special concert to remember those who died in a terror attack at her Manchester Arena gig.