Britney Spears has revealed a startling picture of herself with brunette locks on Twitter.

The pop star - currently engaged on a residency in Las Vegas - took to the social networking site to promote her new fragrances in advance of 14 February.

She wrote: "Spice up Valentine's Day by getting ‘Naughty & Nice' ((pun intended)) ;)."

Spice up Valentine’s Day by getting ‘Naughty & Nice’ ((pun intended)) ;) pic.twitter.com/MCK2z5UKGd

— Britney Spears (@britneyspears) February 9, 2014

Her perfumes are called Fantasy "Naughty Remix" and "Nice Remix", in case you were wondering about the pun.

The new look drew an overwhelmingly positive response from her followers on the social networking site.