Selena Gomez has changed her hair again ... and no, she hasn't gone back to blonde.

She has actually decided to make a more radical change than that ... by shaving her head.

Take a look in the photos below.

When we first read that Selena Gomez had shaved her head, we were really taken aback.

She wouldn't be the first supremely talented singer to do so, and a number of famous actresses have shaved their heads in recent years for beloved, hard-hitting roles in films.

But Selena's hair is legendary.

In her music video for "Naturally," her huge hair would be the most noticeable thing -- if she didn't have to be singing what is perhaps the greatest song that any human has ever produced.

We quickly realized, however, that there are many ways to shave one's head without buzzing the entire thing.

For example: an Undercut. In this case, an undercut at the back.

Selena posted a couple of photos of her new undercut, writing:

"Always need a subtle change. @puma Germany family time [smiley face emoji] grateful for the welcome!"

Wow, she summarized what she's been up to very quickly.

She's clearly busy.

Selena has of course been working with Puma a lot lately.

She and Puma have collaborated to contribute to the Lupus Research Alliance.

(By the way, Selena's neck tattoo is the Roman numerals LXXVI, which is the number 76. Her mother was born in 1976)

Tim Duenas is the hairstylist to whom Selena entrusted the task of giving her this unorthodox undercut.

Sharing the photos of her now-shaved neck, he wrote:

"When your friend calls you to give #selenagomez an undercut... @marissa.marino killing it with the styling."

He thanked both Selena and Selena's stylist for thinking of him for the job.

"Thanks for letting me join in on the fun."

He certainly did her justice.

It's so nice to see Selena Gomez focusing on herself and her career.

So often, the news about her has to do with her love life.

She broke up with The Weeknd last year ... and some still believe that he was just using her for fame.

She broke up -- not for the first time -- with Justin Bieber not too long ago.

While Selena's been spending time on herself, Justin's holding out hope that he and Selena are fated by God to be together.

It sounds like Selena deserves a break -- from boy-drama, anyway.

So this isn't Selena's most drastic change -- not to her life and not to her hair.

But she's walking around with her friend's kidney filtering her blood because her own body's autoimmune system perceives her tissues and organs as the enemy and attacks them sometimes.

Fighting a battle against Lupus or a similarly dangerous disease can really change your perspective on what is or is not too daring of a thing to do with your body.

This undercut is very tasteful and practical and it's intensely stylish.

As always with Selena, there's a lot to love.