Kate left alone as William, Pippa have fun

Prince William, the Duke of Cambridge arrives at the UK premiere of "The Hobbit: An Unexpected Journey" at The Odeon Leicester Square, London. (AP)

While Duchess of Cambridge, Catherine or Kate Middleton nurses herself to overcome her morning sickness due to pregnancy husband Prince William attends the premiere of 'The Hobbit'.

The duchess - who announced her pregnancy last week - was due to attend the world premiere of 'The Hobbit: An Unexpected Journey' along with husband Prince William in London's Leicester Square tomorrow, but has once again been struck by hyperemesis gravidarum, a severe case of morning sickness.

A spokesperson for the royal couple confirmed: "The Duchess of Cambridge will not attend 'The Hobbit' premiere tomorrow evening and will continue to rest privately."

Britain's Prince William, the Duke of Cambridge meets Ian McKellen, right, at the UK Premiere of "The Hobbit: An Unexpected Journey" at the Odeon Leicester Square, London. (AP)

Britain's Prince William, the Duke of Cambridge meets Martin Freeman, second right, at the UK Premiere of "The Hobbit: An Unexpected Journey" at the Odeon Leicester Square, London. (AP)

Pippa Middleton, the younger sister of Prince William's wife Kate promotes the Dutch edition of her book "Celebrate: A Year of British Festivities for Families and Friends"  in a bookstore in Haarlem. (AFP)

Pippa Middleton spoke out on December 12, 2012 in defence of her book on party planning after critics accused her of offering "glaringly obvious" advice. Middleton, 29, reportedly secured an advance worth £400,000 ($650,000, 500,000 euros) for the book from publishers keen to cash in on her fame following last year's royal wedding, but its release in October was met with derision. (AFP)

Kate Duchess of Cambridge arrives for a service of thanksgiving to celebrate Queen Elizabeth's 60-year reign during Diamond Jubilee celebrations in St Paul's Cathedral. (AP)

Catherine, Duchess of Cambridge takes part in a day of activities and festivities to mark the occasion of St Andrew's Day at St Andrew's School. (GETTY/GALLO)

Duchess of Cambridge during a visit to officially open the new Treasures Gallery at the Natural History Museum, in central London. (AP)

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