What do college basketball and pop music have in common? Fans will go to hell and back to cheer on their favorites.

This spring, as 68 collegiate teams square off in the name of NCAA hoops-supremacy, PopCrush will pit 16 of pop's most aggressively loyal fan armies against each other as part of March Music Madness. Don't let the stars' fresh faces and pristine wardrobes fool you — their fans know how to get dirty. Just ask the KatyCats and Arianators.

Though Perry hasn't released an album since 2013's Prism, she wrapped the most successful tour of her career — which spanned nearly 150 stops and made more than $200 million — in October 2015. More importantly, she made a major cultural contribution at the 2016 Golden Globes by reintroducing the Bumpit. Finally, given the fact that she extended an olive branch to rumored frenemy Taylor Swift only weeks ago, we'd say she's grown by leaps and bounds over the past year. Will Katy's fans champion her in this matchup?

Grande, whose Dangerous Woman is inching closer to release, delighted fans with her very own Christmas EP in December 2015, and has been teasing bits of new music since. She's said that her most recent single, "Focus," isn't necessarily indicative of what's to come, but if there's one thing that's been consistent, it's her trend of delightfully shutting down sexist questions in interview segments. Is it time for her Arianators to claim victory?

KatyCats: Are you ready to roar? Arianators: Ready to take out the competition? Place your votes for this round of our March Music Madness tournament until March 9 at 11:59 PM, and check back after to see which group's moving on.

See what these celebrities looked like when their first albums were released: