August 17, 2014:
Where: Watch What Happens Live in NYC
Demi Lovato turns 21 years old today, so to honor the star we're taking a trip down fashion memory lane. We're looking back at her most memorable style moments from the past year. From rocker-chic looks to girlie boho getups, Demi has proved she knows how to make an impact on the red carpet.
Click through the above slideshow to see Demi's best looks, and then wish the singer a happy birthday in the comments!