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Pippa Middleton is listed as the claimant in a case listed to be heard at the High Court in London on Wednesday.
The case is listed as “Middleton & anr v The Person or Persons Unknown“.
Court officials said the claimant was Pippa Middleton.
Yesterday a 35-year-old man who was arrested by police investigating claims that Ms Middleton's iCloud account was hacked was bailed.
He was arrested at an address in Northamptonshire on Saturday evening on suspicion of a Computer Misuse Act offence but was released pending further inquiries, 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.
Private photographs were said to have been offered to The Sun and Daily Mail newspapers via encrypted messaging service WhatsApp.
The Sun said it had been approached by someone using a pseudonym and asking for £50,000 within 48 hours.
The alleged theft comes two years after a host of celebrities, including Hollywood star Jennifer Lawrence, fell victim to a hacker attack on the iCloud - which stores private photos from phones and computers online - which saw images posted online.
In July it was announced that Miss Middleton would marry her financier boyfriend, James Matthews in a society wedding in 2017, with William and Kate saying they were a “wonderful couple”.
Prince William and Kate Middleton’s visit to IndiaShow all 32 1 /32Prince William and Kate Middleton’s visit to India Prince William and Kate Middleton’s visit to India
Prince William and Kate Middleton’s visit to India
Prince William and Kate Middleton’s visit to India
Prince William and Kate Middleton’s visit to India
Prince William and Kate Middleton’s visit to India
Prince William and Kate Middleton’s visit to India Prince William and Catherine, Duchess of Cambridge, paint an elephant statue at Kaziranga Discovery Park in Panbari village, in Kaziranga, some 250 km from Guwahati, the capital of the north-eastern state of Assam
Prince William and Kate Middleton’s visit to India Britain's Catherine, Duchess of Cambridge, feeds a baby elephant at the Centre for Wildlife Rehabilitation and Conservation (CWRC) at Panbari reserve forest in Kaziranga in the northeastern state of Assam, during the royal visit in India
Prince William and Kate Middleton’s visit to India Prince William and Duchess of Cambridge, meet a rhino calf at the Centre for Wildlife Rehabilitation and Conservation (CWRC) at Panbari reserve forest in Kaziranga in the northeastern state of Assam
Prince William and Kate Middleton’s visit to India Catherine and Prince William take a Game drive at Kaziranga National Park at Kaziranga National Park in Guwahati
Prince William and Kate Middleton’s visit to India Catherine, Duchess of Cambridge and Prince William visit a contact centre run by the charity Salaam Baalak, which provides emergency help and long term support to homeless children at New Delhi railway station
Prince William and Kate Middleton’s visit to India Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge meet a young dancer as they watch dancing by the fireside during a Bihu Festival Celebration at Diphlu River Lodge
Prince William and Kate Middleton’s visit to India The Duke and Duchess of Cambridge meet Prime Minister of India Narenda Mod in New Delhi's Hyderabad House during day three of the royal tour to India and Bhutan
Prince William and Kate Middleton’s visit to India Catherine and William visited the Banganga Water Tank. They were given a traditional welcome at Bangana Water Tank and met representatives from SMILE, an organisation working in an economically deprived urban area to support local enterprise
Prince William and Kate Middleton’s visit to India Duchess Of Cambridge enjoys a game of cricket during a visit to meet children from Magic Bus, Childline and Doorstep, at Mumbai's iconic recreation ground, the Oval Maidan
Prince William and Kate Middleton’s visit to India Prince William and Catherine Duchess of Cambridge at India Gate in New Delhi
Prince William and Kate Middleton’s visit to India Prince William and his wife Catherine take part in an event at the Gandhi Smriti, a museum dedicated to Mahatma Gandhi, in New Delhi
Prince William and Kate Middleton’s visit to India Prince William and Duchess of Cambridge meet young entrepreneurs during a visit to Mumbai
Prince William and Kate Middleton’s visit to India The Duke and Duchess of Cambridge prepare to lay a wreath at the Inida Gate in New Delhi
Prince William and Kate Middleton’s visit to India The Duke and Duchess of Cambridge remove their shoes at Gandhi Smriti in New Dehli, India before paying their respects at the Mahatma Gandhi memorial
Prince William and Kate Middleton’s visit to India The Duke and Duchess toured the museum housed in the Old Birla House and paid their respects at the place where Mahatma Gandhi's life ended on 30 January 1948
Prince William and Kate Middleton’s visit to India Duchess of Cambridge and Prince William pose for a picture at India Gate Memorial
Prince William and Kate Middleton’s visit to India Prince William and Catherine pay their respects at the place where Mahatma Gandhi's life ended on 30 January 1948, at Gandhi Smriti, the Old Birla House museum
Prince William and Kate Middleton’s visit to India The Duke and Duchess of Cambridge poses with local school children as they tour Old Birla Hous in Gandhi Smriti in New Dehli
Prince William and Kate Middleton’s visit to India The Duke Duchess of Cambridge meet children from local charities Magic Bus, Childline and Doorstep, and join game of cricketwith boys from the Dilip Vengsarkar Academyat the Oval Maidan recreation ground
Prince William and Kate Middleton’s visit to India The Duke and Duchess of Cambridge are garlanded as they arrive at the Banganga Water Tank in Mumbai
Prince William and Kate Middleton’s visit to India Catherine, Duchess Of Cambridge plays football during a visit to meet children from Magic Bus, Childline and Doorstep
Prince William and Kate Middleton’s visit to India The Duke and Duchess of Cambridge react after playing football during a visit to the Banganga Water Tank in Mumbai
Prince William and Kate Middleton’s visit to India Duchess of Cambridge and Prince William play football games during a visit to the Banganga Water tank, where they met representatives of SMILE
Prince William and Kate Middleton’s visit to India The Duke and Duchess of Cambridge arrive at a Bollywood Charity Gala hosted by the British High Commission and the British Asian Trust at the Taj Mahal Palace hotel in Mumbai
Prince William and Kate Middleton’s visit to India Catherine, Duchess of Cambridge arrives for a Bollywood Inspired Charity Gala at the Taj Mahal Palace Hotel
Prince William and Kate Middleton’s visit to India Prince William and Duchess of Cambridge speak with Boman Kohinoor during a meeting in Mumbai
Prince William and Kate Middleton’s visit to India The Duke and Duchess of Cambridge stand after laying a wreath on the martyrs memorial at the Taj Mahal Palace Hotel in Mumbai
Hedge fund boss Mr Matthews got down on bended knee during a trip to the Lake District after they had dated for less than a year.
Press Association.
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