Ant McPartlin and Declan Donnelly have signed a £2.8 million autobiography deal.
The TV duo entered talks with Penguin Books earlier this year and finalised their plans two weeks ago. They will work on their life story together in the coming months, and the book will be released in time for Christmas 2009.
"We've considered working on a book for quite a while," Ant told the Sunday Mirror. "But next year we will have been working together for 21 years, so we feel the time is right."
Dec added: "We're really looking forward to reminiscing about our past and moments from behind the scenes, however embarrassing they may be."
Penguin's Katy Follain said: "Publishers have been pursuing the duo for years. We are hugely excited. There's a wealth of behind-the-scenes anecdotes waiting to be told."
The pair worked together for the first time when they joined kids' TV show Byker Grove in 1989. They have since gone on to become the highest-paid personalities on British television.
2009 Thats ages away