Britney Spears’ transformation from troubled starlet to credible pop icon took something of a detour today, with news that her ex-boyfriend is offering to sell a sex tape.

Just a day after Spears announced plans for her first world tour since 2004, her Birmingham-born former partner Adnan Ghalib confirmed rumours that a Britney sex tape exists and that he would sell it for the right price.

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However, the paparazzo photographer refused to discuss prices for hypothetical enquiries telling Heat magazine: "Unless there is a locked-in deal, I will go no further. I am not interested in selling out any other details about Britney."

The video was allegedly shot while on holiday in Mexico earlier this year and is thought to feature Spears wearing nothing but a pink wig.

The couple dated for around three months earlier this year, in the midst of a traumatic period for the singer which saw her sectioned and enter rehab. They went their separate ways when Spears allegedly discovered Ghalib having an affair.