THE VOICE --
Trae Patton/NBC

Monday found The Voice going into its first night of the knockout round, but Twitter was fixated on something else: Adam Levine's facial hair. After rocking a mountain man beard earlier this season, tonight he sported a more fresh-faced look (although not totally devoid of scruff), and the Twitter reaction was mixed. Let's take a look at Adam's various bearded and non-bearded incarnations.

THE VOICE --
Trae Patton/NBC

1. Scruffy Adam
This is the Adam we saw tonight. Notice the slight 5:00 shadow, pairing nicely with the plaid shirt for a look that's either Brooklyn Cool or too-lazy-to-really-shave, depending on your point of view.

THE VOICE --
Trae Patton/NBC

2. Beardy Adam
Woah, is that the Maroon Five singer or a guy from ZZ Top? Just kidding. Still, Adam's beard has reached some impressively grungy heights (er, lengths?) over the years, leading one user to comment:
AP/NBC

We'll let you be the judge of that one.

TV NBC The Voice (This image released by NBC shows Adam Levine at AP/Chris Haston

3. Really Beardy Adam
Okay, this is just out of control. If you squint hard enough I'm pretty sure you can see small forest creatures living in there. No more of this, Adam. No more of this.

Whichever way you slice it (or, uh, shave it) one thing is for certain: contestants on The Voice may come and go, but Adam Levine's facial hair is forever. Which one's YOUR favorite?