Kate Middleton is still suffering from acute morning sickness as she has canceled her appearance at "The Hobbit" premiere in London on Tuesday.
Also known as the Duchess of Cambridge, 30-year-old Middleton and her husband Prince William announced that they are expecting their first child last week.
Because of her pregnancy, the Duchess is suffering from hyperemesis gravidarum, or acute morning sickness, which includes symptoms such as excessive vomiting and nausea.
Palace officials said Tuesday that Prince William will attend the film's premiere, but that his wife "will continue to rest privately," according to the Associated Press.
The event surrounding "The Hobbit" is a benefit for the Cinema and Television Benevolent Fund, and Prince William will meet trustees and beneficiaries of the charity, the filmmakers, as well as members of the cast.
Tuesday's engagement is not the first cancellation Middleton has been forced to make since checking out of King Edward VII Hospital on Thursday where she was treated for the sickness.
Moreover, Prince William canceled his appearance at the British Military Tournament on Sunday in order to be by his wife's side.
"The Duke of Cambridge will no longer attend the British Military Tournament at Earl's Court this evening," said a representative for the royal couple on Sunday. "But will spend Sunday privately with the Duchess instead."
The rep added that Middleton would likely have regular bouts with hyperemesis gravidarum in the coming weeks as her pregnancy is in early stages.
"It is well known that hyperemesis gravidarum often recurs and, until further notice, to allow the Duchess a degree of privacy during her pregnancy, we do not intend to offer regular condition checks or advise of routine developments associated with it," Saint James Palace added.
While the Duchess manages her pregnancy, the Duke of Cambridge has stepped out solo. During the Winter Whites Gala on Saturday, Prince William even commented on his wife's condition.
"I don't know why they call it morning sickness- they should call it all day and all night sickness," the British royal told former Centrepoint chairman Michael O'Higgins.
"It's a long old process but she is getting there," the Duke added. "She feels like it is going to go on forever."
Middleton's condition has been met with sympathy from many of her fans that continue to wish her well as the pregnancy progresses.