It emerged last night that the paparazzo's name had been handed over to the authorities who are investigating the incident.
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A preliminary criminal investigation was launched last month after the publication of the images in French Closer.
"A name has been offered," a source close to the case was quoted as saying by the Daily Mail.
"The photographer is expected to be held for question[ing]... imminently."
French public prosecutor Marie-Christine Daubigney said: "This new information regarding the photographer will be passed on to investigating magistrates."
Metro claims that the photographer is thought to be one of a "notorious band" of press who followed Princess Diana in the week leading to her death in 1997.
A royal source added to The Mirror: "William and Kate are determined to bring the person who took those photos to justice and they're pushing hard for a custodial sentence. They want to make an example of this person."
The photographer could be jailed for up to a year and fined £36,000 for breach of privacy if found guilty.
It was recently suggested that the paparazzo who took the photographs was in fact an Englishman living in the south of France.
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Copyright: Rex Features