Demi Lovato may be known for her technicolor tresses, but she recently surprised us by making a more natural change to a warm brown shade. And just in time for her 22nd birthday! Let's hope she's not done dyeing — looking through her hair history is almost like recounting all the colors of the rainbow. Celebrate the singer's big day by taking a look back at her best hair hues.
Source: Getty 
Demi cropped her coif even more (and took all of the purple with it)! At an appearance on Good Morning America, her shorter style revealed only a trace of its former self — blond edges.
Another day, another hair change for Demi. The star flashed a smile and her new lob-length haircut to her Instagram  followers. Looks like the silver portion of her ombré strands was left on the cutting room floor.
Source: Instagram user ddlovato 
Demi's newest color is a lavender and silver ombré. Maybe she's taking cues from Kelly Osbourne and Nicole Richie , who have both rocked purple hair hues this Summer.
Demi dyed her long locks half blond back in May with one side shaved into an undercut.
Demi went for a bold look earlier this year and dyed all her hair pink during her Neon Lights tour.
Demi sported a deep shade of blue in December 2013 with pieces of sky blue mixed in.
This particular blue-green ombré look reminds us of the sea.
We're guessing blue is one of Demi's favorite hair colors, because she has worn it so many different times and in so many different shades.
Demi, a natural brunette, went for the full-blown blond look last Fall.
Before that she dyed her hair a deep shade of brown and sported a shoulder-length bob.
Demi truly has tried it all, including blunt bangs and a honey-blond hair color.
Demi paired her red dress with red locks back in 2012, but her hair color habit was just beginning . . .