Ananova:

Christina Aguilera is to release her new single the same day as Britney Spears.

Christina has moved the release date of her next single Carwash so she can go head-to-head with Britney.

Her track will now be released on November 1 - not October 25 - the same day as Britney's My Prerogative will hit shops reports The Sun.

Christina's track - a collaboration with Missy Elliot from the animated flick Shark Tale - was originally recorded by Rose Royce in the Seventies. Newlywed Britney's tune was a Top Ten hit for Bobby Brown in 1988.

Britney has had two No1 hits this year while Christina is yet to hit the top spot in 2004.