12/11/2012 09:11 EST | Updated 02/10/2013 05:12 EST

Kate Middleton Ill Again: The Duchess Of Cambridge Cancels Visit Due To Acute Morning Sickness

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Catherine the Duchess of Cambridge leaves the King Edward VII hospital in central London, on December 6, 2012. Prince William's pregnant wife Catherine left a London hospital four days after she was admitted for treatment for acute morning sickness, an AFP photographer said.AFP PHOTO/Leon Neal (Photo credit should read LEON NEAL/AFP/Getty Images)

LONDON -- The former Kate Middleton has cancelled a planned appearance at the U.K. premiere of "The Hobbit" due to acute morning sickness.

Palace officials said Tuesday Prince William's wife, now known as the Duchess of Cambridge, will continue to rest rather than go to the show.

William still plans to go to the premiere.

Middleton has cancelled all public engagements since her brief hospitalization last week for severe nausea and dehydration. She is suffering from a condition known as hyperemesis gravidarum that causes sustained nausea and discomfort.

Her pregnancy is still in early stages.

How the media has covered the royal pregnancy:

Media Covers Kate Middleton's Pregnancy