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The royals are reported to be fuming over the appearance of the photographs on the cover of Australian weekly 'Woman's Day'.
The Palace is as yet refusing to make an official comment on the publication of the photographs.
The photos, which show the newly-minted Duke and Duchess of Cambridge strolling along a beach in swimwear, have taken 15 months to surface, possibly because their owners understood publishing them would earn the Palace's ire.
Will sports a pair of loud boardshorts in the pics while Kate looks very trim in a black bikini.Related: Kate's ugly makeover
The images have clearly been taken with a long range lens, and the young couple are understandably unhappy with the security breach.
The royal couple retreated to North Island in the Seychelles to spend their honeymoon in bungalows, reported to cost $5000 a night.
Will and Kate were very clear about their desire to have a paparazzi-free honeymoon after the hoopla of their engagement and wedding.
Media outlets and agencies in the UK agreed at the time to respect the newlyweds' plea for privacy, meaning it's unlikely that the photographs will ever be published in the UK.Related: Pippa wears Kate's engagement dress
Next month marks the 15th anniversary since the death of Prince Will's mother, Princess Diana, in a high-speed car chase in Paris.
An inquest into the princess's death found that the fatal accident occurred as a result of negligent driving and the pursuing paparazzi.
It's understood that Will wants to protect his young wife from the full brunt of media scrutiny that marked his mother's final years.Find more fashion news at Yahoo!7 Lifestyle's Facebook pagePrince William celebrates his 30th birthday in a private affair: