An American business is claiming it can hire out Pippa Middleton for £90,000 a time.

Celebrity Talent Promotions says Pippa - the sister of Britain's Duchess Catherine - is available for ''corporate appearances, speaking engagements, endorsements and autograph signings'' and has posted a picture of the 28-year-old beauty on its website.

Below the image it says: ''We are a celebrity booking agency that also hires Pippa Middleton... as a keynote presenter for speaking engagements, trade shows, conventions and store grand openings.''

It adds that, for a price, she can be booked for ''event hosting, licensing deals, product endorsements, print advertising and television commercials''.

However, Pippa is not connected to the Florida-based firm and cannot be hired out by them.

When newspaper the Daily Star Sunday phoned asking to book Pippa, they were told it would cost £62,000 to £93,000.

Worker Adam Plotkin added: ''You have to understand that she is connected to royalty so there are security issues here. The final figure might even be much higher.

''We're talking about two or three first-class round-trip airline tickets from London, plus five-star hotel accommodation while she's here. If you email me all the details about your event we will forward them to her.''

An official spokesman for Pippa - sister-in-law of future king Prince William - promised an immediate investigation, adding: ''This company does not represent my client and has no authority to make these claims about her on its website. We will be contacting them about this issue.''