As of March 14, the "Hands to Myself" singer had 69.4 million followers. Taylor, though, had 69.2 million, perhaps setting up a full fledged battle of the besties!
Like the other women, Selena is widely active on social media, particularly Instagram. She routinely gets millions of "likes" for images. Over the weekend she posted a snap of her and friend Courtney Barry. That image got 2.1 million likes.
In February she went all nostalgic and posted a throwback photo of herself with Barney the purple dinosaur. Fans went nuts for that, as she racked up 3.1 million likes for that single photo.
She often posts images of her with other celebs, as well. One person who don't see on her page is rumored boyfriend Samuel Krost.
"I'm utilizing social media right now because of my age and because, to be honest, everybody else in the world was talking about me, so I wanted a f------ say," she told W earlier this month.
Selena, though, isn't the only social media rockstar. Vin Diesel, it was revealed, is also someone to be revered in the online popularity contest.
The "Fast & Furious" star has nearly 100 million likes on Facebook, more than double that of President Barack Obama, and putting him on the Mount Rushmore of social media popularity and ranking high among stars with surprisingly big Facebook followings.
Vin ranks only behind only soccer star Cristiano Ronaldo (110 million) and singer Shakira (104 million), both of whom have huge international followings.
Over the weekend, the New York Times said Vin's Facebook page is "more than just a fan page: it's a home base, a community hub where people can compliment Vin Diesel, express gratitude over Vin Diesel and ogle photos of Vin Diesel."
It's commonly referred to by fans as VinBook.
In 2013, he spoke about his following. "What Facebook didn't realize is something very big was about to happen, and that was — for the first time in history, and it's kind of a fluke they didn't see this coming — when I jumped on that page in April 2009, I started talking to people. In the realest ways," Diesel told Entertainment Tonight. "Imagine if you could've been a Facebook friend to Marlon Brando, or whoever your role models are. Imagine, if you were able to Facebook Elvis, and talk to him, and hear from him without the Hollywood of it all."