Police investigating claims that Pippa Middleton's iCloud account was hacked have arrested a 35-year-old man in Northamptonshire, Scotland Yard said.
Pictures of the Duchess of Cambridge and her children, Prince George and Princess Charlotte, are reportedly among 3,000 images taken from Kate's sister.
Police said that the man had been taken into custody at a south London police station after being arrested on suspicion of a Computer Misuse Act offence.
The Sun and Daily Mail newspapers reported that an anonymous seller had offered to sell them the pictures via encrypted messaging service WhatsApp.
The images reportedly include some of the royal children as well as wedding dresses and parties.
The Sun said it had been approached by someone using a pseudonym and asking for £50,000 within 48 hours.