And despite what its name denotes, this hairstyle is anything but casual.

Yes, it’s even perfect for a black-tie event.

Just check out that detail.

Millie Bobby Brown and Brooke Shields Prove a Messy Bun Is BlackTie

And Nicky Hilton’s bun is so round we have to ask: Was asockinvolved in the construction?

But it’s especially for those who are bun-agnostic and like to switch it up.

With our buns, the sky is literally the limit.

Millie Bobby Brown and Brooke Shields Prove a Messy Bun Is BlackTie

Dimitrios Kambouris/Getty Images

Millie Bobby Brown and Brooke Shields Prove a Messy Bun Is BlackTie

Dimitrios Kambouris/Getty Images

glamour women of the year brooke shields

Dimitrios Kambouris/Getty Images

Millie Bobby Brown and Brooke Shields Prove a Messy Bun Is BlackTie

Dimitrios Kambouris/Getty Images

Millie Bobby Brown and Brooke Shields Prove a Messy Bun Is BlackTie

Dimitrios Kambouris/Getty Images

Millie Bobby Brown and Brooke Shields Prove a Messy Bun Is BlackTie

Dimitrios Kambouris/Getty Images