These pop divas have the blues, but which one wore the color best? For today's reader's poll, we want all of you PopCrush readers to vote on which starlet rocks the blue hairdo best.

While Gwen Stefani opted for the rocker look when she stepped onto the red carpet at the 1998 MTV VMAs, Nicki Minaj went with a girly yet edgy blue and blond afro during fashion week in 2011. Katy Perry also traded in her pink locks for a blue 'do recently, and Lady Gaga has been seen sporting a bluish-turquoise bob in the past. Finally, Selena Gomez decided to give her hairstyle some subtle blue streaks.

So, out of these five pop songstresses, which one do you think looks best with blue hair? Cast your vote below!