There must be something in the pop star hottie water, because Zayn Malik, Austin Mahone and Kendall Schmidt have all changed up their looks (and locks!) within the past few weeks. Whose haircut is your fave?

Zayn Malik showed off his brand new 'do on Instagram, taking a selfie that showed off his buzzed sides and the sleek, slicked back hair he left on top. While we're silently weeping over the demise of his long locks (that curl!), Zayn didn't shave the whole thing off -- in fact, he left the top long enough to put it in a man bun! So stylish.

Like Zayn, Austin Mahone also chose to buzz the sides of his hair, leaving the rest long enough to look just the right amount of messy -- and we all know how much Austin loves the sexy bedhead "I woke up like this" look. And, hey, Austin? We love it too.

Kendall Schmidt is the third member of the buzz cut club, shaving the sides but leaving a strip of long hair in the middle, kinda like a faux hawk without the spikes. While he chose to buzz some of his locks, we love how he kept his facial hair intact. We're all about the scruffy look.

Whose haircut do you like best? Cast your vote for Zayn Malik, Austin Mahone or Kendall Schmidt in the poll below!

See Kendall Schmidt + More Celebs' Sexiest Selfies