By Gabby Noone

Last week, Demi Lovato debuted blonde hair for the first time in years.

But today she posted a selfie in which she appears to have returned to her signature brunette color.

This really makes you think. Did she go through the tedious bleaching process for a mere week, just to test whether blondes really have more fun? Was the blonde a wig? Is time an illusion?

Like sands through the hourglass, these are the days of Demi Lovato’s hair.