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Last Updated: Wednesday July 09 2008 13:38 GMT

Britney in 'secret' Madonna video

Britney Spears and Madonna

Pop star Britney Spears is set to make a special appearance at Madonna's world tour, which kicks off next month.

But concert goers won't see Britney in person, because she will be appearing in a video, which will be shown as part of Madonna's show.

A spokeswoman for the queen of pop said Britney was doing some filming - but wouldn't give away any more details.

She said: "There is footage being shot of Britney Spears some time this week - the rest is 'a secret'."

Madonna kicks off her Sticky & Sweet tour on 23 August in Cardiff and will perform at the Wembley Stadium in London in September.

She'll then travel through Europe, before taking her show to America.