Britney Spears has hinted she is rehearsing for a ''top secret'' new video.

The star revealed she was practicing for the mystery project - due to happen ''next week'' - but didn't confirm what the rehearsals were actually for.

She wrote on Twitter: ''Taking a quick break to say hi to all my tweeps :) Rehearsing for something top secret happening next week... #WERK''

When a fan responded speculating it could be a video for a new single, Britney simply replied with a wink.

The 'Hold It Against Me' singer's new album - the follow-up to 2011's 'Femme Fatale' - will be produced by Naughty Boy and it is expected the first single could be released next month.

A countdown clock - captioned ''All Eyes On Me'' - appeared on her website promising a big announcement on September 17 - with many speculating it could be the first song from the record, although it could be details of her eighth full-length.

Naughty Boy has been trying to expand Britney's influences for the album, with reports suggesting he wants to take her to the Lake District - England's largest national park - for inspiration.

A source previously said: ''He's planning to take Britney on a tour. They'll be holed up at his studio in Ealing for most of the time but he wants to weave in a visit to the Lake District. He loves it there.''