It's officially March 1. And you know what that means: March Madness time.

Just as we did last year, we've rounded up the most fiercely dedicated fans in pop music — from Lady Gaga's Little Monsters to Adam Lambert's Glamberts to Beyonce's BeyHive — and paired 'em off for what will likely be yet another grueling fight to the finish in a tournament between the ever-loyal groups for the highly coveted crown as this year's Best Fanbase.

The loyal Little Monsters took the title last year, but who will win this year?

The match-ups for 2016 were just announced, so get to voting below. The first round ends on March 9 at 11:59 PM EST.

Britney Spears' Army vs. Rihanna's Navy
Little Mix's Mixers vs. Girls' Generation's Sones
Fifth Harmony's Harmonizers vs. 2NE1's Blackjacks
Adam Lambert's Glamberts vs. 5 Seconds of Summer's 5SOSFAM
Justin Bieber's Beliebers vs. One Direction's Directioners
Lady Gaga's Little Monsters vs. Beyonce's BeyHive
Demi Lovato's Lovatics vs. Selena Gomez's Selenators
Katy Perry's KatyCats vs. Ariana Grande's Arianators

Second Round

Adam Lambert's Glamberts vs. Girls' Generation's Sones
Beyonce's BeyHive vs. Demi's Lovatics
Britney Spears' Army vs. 2NE1's Blackjacks
Katy Perry's KatyCats vs. One Direction's Directioners

Semi-Finals

One Direction's Directioners vs. Britney Spears' Army

Adam Lambert's Glamberts vs. Beyonce's BeyHive

Final Round

Adam Lambert's Glamberts vs. One Direction's Directioners