Katy Perry debuted with blue hair at her first public appearance on Friday after her split with Russel Brand in December 2011.

The electric blue hair colour added to her stunning looks in a short black cocktail dress at the GiveLove charity event held in Las Vegas to raise support for earth quake-ravaged Haiti.

Katy Perry is known for switching her hair colours and has showcased her coloured hairdos at many red carpet appearances throughout last year.

Check out the "I Kissed A Girl" singer in her varied hairstyles over the past one year:

U.S. singer Katy Perry poses on arrival on the red carpet at the MTV Europe Music Awards show in Belfast November 6, 2011.Reuters
Pop icon Katy Perry's marriage to comedian Russell Brand may not have ended like one of her catchy love songs, but is pretty clean as far as divorces are concerned. Under Calif. state law Brand is entitled to half of Perry's earnings, but the British movie star won't accept it.Reuters
Singer Katy Perry arrives at the 2011 American Music Awards in Los Angeles November 20, 2011.Reuters
Singer Katy Perry holds up her special achievement award, which she received for being the first female pop artist with five number one hits from one album, at the 2011 American Music Awards in Los Angeles November 20, 2011.Reuters
Singer Katy Perry poses on arrival at the 53rd annual Grammy Awards in Los Angeles, California February 13, 2011.Reuters
Katy Perry accepts the award for video of the year for "Firework" at the 2011 MTV Video Music Awards in Los Angeles August 28, 2011.Reuters
Singer Katy poses for photographers after winning Video of the Year for "Firework", Best Collaboration, and Best Special Effects at the 2011 MTV Video Music Awards in Los Angeles August 28, 2011.Reuters
Katy Perry with her new blue hair colour during a charity event in Las Vegas on January 27, 2012.You Tube Screengrab