Vocal sensation Jessie J has taken to social networking site Twitter to debut a brand new hair style.

The pop songstress, who often changes the colour of her trademark blunt-fringed 'do, posted a photograph of a sleek new look earlier this afternoon (March 29) and accompanied the picture with the caption: "Look I'm Blonde :D wooooooo".

Back in January, the 'Who's Laughing Now' hitmaker promised to shave her head for charity and revealed that she is "excited" to raise money for a worthy cause although she is yet to confirm further details on the fundraising plans.

She is currently acting as a vocal coach on the first UK series of The Voice and is hot on the promotional trail for the show, adding that today was a "busy day with meetings."

Watch Jessie J surprise a fan as part of the MasterCard Priceless Duets series below: