Edis Kayalar has been found guilty of extorting money from the supermodel - who is married to Rande Gerber - by threatening to release a photograph of her then-seven-year-old daughter Kaia gagged and bound to a chair.

Court documents from his appearance in court in Kirchheim unter Teck, Germany state that Kayalar - who turned himself into police in Germany last November - stole the photograph from the couple's former nanny in 2009.

Cindy reportedly gave into Kayalar's initial requests and paid him $1,000 for a copy of the image.

However, Kayalar attempted to extort a further $100,000 from the couple and repeatedly threatened to sell or release the photograph to the media if they failed to pay.

According to the documents, Kaia - who is now eight - told her parents the photo, which they had been unaware of, was taken during a "cops and robbers" game with her nanny.

Cindy and Rande married in 1998 and they also have a 10-year-old son Presley.