David Walliams has written a book about close friend Simon Cowell and his new son Eric.
The 'Britain's Got Talent' judge has given the media mogul - who welcomed his first child with New York socialite Lauren Silverman in February - 50 copies of the book, titled 'David Walliams Presents Baby Eric'.
Simon, 54, was surprised by the gesture and initially believed it was going to go on sale in shops.
An insider told The Sun newspaper: "He [Simon] didn't quite know what to say."
Simon later said: "It is very sweet."
David shared a picture of the book's cover, which depicts Simon holding the baby while his girlfriend Lauren is beside them beaming with pride.
He captioned the picture, posted on his Twitter account, by writing: "This is the cover of the book I wrote especially for @SimonCowell & Lauren's son Eric... (sic)"
A blurb on the back cover reportedly reads: "Simon Cowell was the man who thought he had everything, until the day Baby Eric arrived in his life."
David - who has 12-month-old son Alfred with wife Lara Stone - has written a number of children's books.
He first signed a contract with HarperCollins in 2008 and made his debut with 'The Boy in the Dress', illustrated by Quentin Blake, while his most recent book is titled 'Demon Dentist'.
Tagged in David Walliams Simon Cowell Lauren Silverman