Kelly Clarkson is just a doll. From her bubbly, down-to-earth demeanor and adorable looks to her amazing vocals and powerful songs, the Texan is really the full package. That Brandon Blackstock is one lucky guy!

In addition to evolving musically over the years, Clarkson has also altered her look a few times, but never anything too crazy. Mostly, she likes to go back and forth between blond and brunette shades of hair, and today (April 24), on her 31st birthday, we want to know which hair color you think looks best on the 'Stronger' songstress.

Even though she's had blond locks in the past, throughout the latter half of 2012 and early 2013, Clarkson has been steadily rocking a towheaded look. The 'Catch My Breath' hit maker looks stunning with the lighter shade of locks, as her milky complexion and beautiful hazel eyes really pop with the softer hue.

However, Ms. Clarkson also has an affinity for wearing darker shades, and has dyed her hair a variety of browns throughout her career. Most recently, she was seen with the lighter chocolate-y locks pictured above in early 2012, but she's also gone darker and lighter, playing around with the hue every time she decides to switch it up.

So, which is it? Do you like Kelly better as a blonde or a brunette? Vote below!