(Cover) - EN Showbiz - Britney Spears has told fans they will be in for a treat when she officially unleashes her new single on Tuesday.

The 29-year-old singer is considered one of pops biggest stars, having enjoyed vast international success with previous albums including ...Baby One More Time, In the Zone and Circus.

Fans of the star are eagerly awaiting her new material, and early demos of her upcoming track Hold It Against Me have been leaked online to huge approval. Britney has now taken to her page on social-networking site Twitter to tease fans, telling them the final version is even better.

"Heard an early demo of my new single leaked. If u think that's good, wait till you hear the real one Tuesday (sic)," wrote the singer.

Britney also posted a picture of the Hold It Against Me cover. The singer is smouldering at the camera for the artwork, with soft make-up and luscious blonde locks. Some of the pretty singers face is obscured by her hands in the artistic close-up shot, which her followers have been quick to praise.

In 2009 Britney released The Singles Collection, a disc featuring her greatest hits, to huge success, although her admirers are keen to hear the exciting new material. (C) Cover Media