Kate Middleton and Cheryl Cole Credit: Stefan Rousseau - WPA Pool/Getty; Dave J Hogan/Getty

Duchess Kate: Wannabe pop star?

Very, very little has been revealed about what went down at Kate Middleton's bachelorette party (or "hen party" in British-speak) leading up to her April 29, 2011 wedding to Prince William.

But British pop superstar Cheryl Cole claims fresh new details about the future Queen's wild night in her memoir Cheryl: My Story -- revealing that Kate, 30, dressed up like Cole, 29, and performed a sexy tribute performance to the Girls Aloud singer.

"Kate confessed that she dressed up as me on her hen night, in a bodysuit and split trousers, and sang 'Fight For This Love,'" Cole writes of a song popular in the UK. Cole -- who was initially slated to appear on season one of Fox's X-Factor before Simon Cowell fired her -- explained that Prince William spilled the details to her at the Queen's Diamond Jubilee concert in June.

"She even learnt the dance routine and was step-perfect by all accounts, as her sister Pippa and brother James also came over and told me all about it," Cole marvels of the Duchess' sister, 28, and brother. 25.

A hugely successful solo artist in England, Cole and the other four members of Girls Aloud are set to reunite next Friday, Oct. 19 with the release of a new charity single, their first project together in three years.