Demi Lovato Demi Lovato

Demi Lovato's hair is like a river: It's always there, but never the same.

The "Heart Attack" singer debuted her latest look on Twitter Tuesday night, revealing a brand new side undercut.

Stars who shave their heads

Lovato's no stranger to the dramatic makeover. She's only had her hot pink locks since January, after previously trying out blue, red and blonde.

What do you think of Lovato's new look?