Catherine, Duchess Of Cambridge has pulled out of an appearance at the London premiere of The Hobbit: An Unexpected Journey on Wednesday (12Dec12).

The Duchess was hospitalised last week (begs03Dec12) suffering from hyperemesis gravidarum, which leaves expectant mothers feeling severely sick in the early months of pregnancy.

She was later released to recover at Kensington Palace, the London residence she shares with her husband Prince William, but is still not well enough to walk the red carpet at the U.K. premiere of the highly-anticipated Lord of the Rings prequel.

A spokesperson for St James's Palace says, "The Duchess of Cambridge will not attend The Hobbit premiere tomorrow evening and will continue to rest privately. The Duke of Cambridge will attend as planned."