Rainbow reigns supreme! When it comes to this season's hottest trend, everyone's flocking to bright pastels as their Spring hair colors of choice. Aren't visions of Jem and the Holograms and Rainbow Brite running through your head? Katy Perry and Kristen Stewart have sported green and orange, respectively, while Nicole Richie settled on a cool shade of lavender.

Nicole's colorist, Daniel Moon of Andy Lecompte Salon, discussed with me what it was like getting the last-minute text to color her hair, which was inspired by a photo that was altered by social media. (Something I had a little fun with too!) Plus, he explains the four-step process of going bold with your color — including the essential product you need to maintain your color at home.

On Kirbie: Raoul dress