PHOTOS: Katy Perry's Eye-Popping Hair Colors

(Reuters)

Perry arrives at the 2010 MTV Movie Awards in Los Angeles on June 6, 2010. (Reuters)

Perry arrives at the 2010 MTV Video Music Awards in Los Angeles, California on September 12, 2010. (Reuters)

Perry signs autographs as she walks the red carpet before the MuchMusic Video Awards in Toronto on June 17, 2012. (Reuters)

Perry performs during the Victoria's Secret Fashion Show at the Lexington Armory in New York on November 10, 2010. (Reuters)

The singer attends the premiere of "The Smurfs" at the Ziegfeld Theater in New York on July 24, 2011. (Reuters)

Perry accepts the award for video of the year for "Firework" at the 2011 MTV Video Music Awards in Los Angeles on August 28, 2011. (Reuters)

Perry poses on arrival on the red carpet at the MTV Europe Music Awards show in Belfast on November 6, 2011. (Reuters)

Perry poses for photographers at the 2011 American Music Awards in Los Angeles on November 20, 2011. (Reuters)

Perry arrives at the 20th annual Elton John AIDS Foundation Academy Awards Viewing Party in West Hollywood on February 26, 2012. (Reuters)

Perry arrives on the red carpet for the Echo Music Awards ceremony in Berlin on March 22, 2012. (Reuters)

Katy Perry arrives at Nickelodeon's 25th annual Kids' Choice Awards in Los Angeles on March 31, 2012. (Reuters)