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Open Image ModalBritain's Prince William stand next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London, Thursday, Dec. 6, 2012. Prince William and his wife Kate are expecting their first child, and the Duchess of Cambridge was admitted to hospital suffering from a severe form of morning sickness in the early stages of her pregnancy. (AP Photo/Alastair Grant) (credit:AP)
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Open Image ModalBritain's Prince William stand next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London, Thursday, Dec. 6, 2012. Prince William and his wife Kate are expecting their first child, and the Duchess of Cambridge was admitted to hospital suffering from a severe form of morning sickness in the early stages of her pregnancy. (AP Photo/Alastair Grant) (credit:AP)
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Open Image ModalBritain's Prince William stand next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London, Thursday, Dec. 6, 2012. Prince William and his wife Kate are expecting their first child, and the Duchess of Cambridge was admitted to hospital suffering from a severe form of morning sickness in the early stages of her pregnancy. (AP Photo/Alastair Grant) (credit:AP)
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Open Image ModalBritain's Prince William stand next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London, Thursday, Dec. 6, 2012. Prince William and his wife Kate are expecting their first child, and the Duchess of Cambridge was admitted to hospital suffering from a severe form of morning sickness in the early stages of her pregnancy. (AP Photo/Alastair Grant) (credit:AP)
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Open Image ModalBritain's Prince William stand next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London, Thursday, Dec. 6, 2012. Prince William and his wife Kate are expecting their first child, and the Duchess of Cambridge was admitted to hospital suffering from a severe form of morning sickness in the early stages of her pregnancy. (AP Photo/Alastair Grant) (credit:AP)
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Open Image ModalBritain's Prince William stand next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London, Thursday, Dec. 6, 2012. Prince William and his wife Kate are expecting their first child, and the Duchess of Cambridge was admitted to hospital suffering from a severe form of morning sickness in the early stages of her pregnancy. (AP Photo/Alastair Grant) (credit:AP)
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Open Image ModalBritain's Prince William stands next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London, Thursday, Dec. 6, 2012. Prince William and his wife Kate are expecting their first child, and the Duchess of Cambridge has been admitted to hospital suffering from a severe form of morning sickness in the early stages of her pregnancy. (AP Photo/Alastair Grant) (credit:AP)
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Open Image ModalBritain's Prince William stand next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London, Thursday, Dec. 6, 2012. Prince William and his wife Kate are expecting their first child, and the Duchess of Cambridge was admitted to hospital suffering from a severe form of morning sickness in the early stages of her pregnancy. (AP Photo/Alastair Grant) (credit:AP)
Duchess of Cambridge expecting(09 of39)
Open Image ModalBritain's Prince William stands next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London, Thursday, Dec. 6, 2012. Prince William and his wife Kate are expecting their first child, and the Duchess of Cambridge has been admitted to hospital suffering from a severe form of morning sickness in the early stages of her pregnancy. (AP Photo/Andrew Matthews) (credit:AP)
Duchess of Cambridge expecting(10 of39)
Open Image ModalThe Duke and Duchess of Cambridge leave the King Edward VII hospital in London where the Duchess of Cambridge had been admitted with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(11 of39)
Open Image ModalThe Duke and Duchess of Cambridge leave the King Edward VII hospital in London where the Duchess of Cambridge had been admitted with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(12 of39)
Open Image ModalThe Duke and Duchess of Cambridge leave the King Edward VII hospital in London where the Duchess of Cambridge had been admitted with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(13 of39)
Open Image ModalThe Duke and Duchess of Cambridge leave the King Edward VII hospital in London where the Duchess of Cambridge had been admitted with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(14 of39)
Open Image ModalThe Duke and Duchess of Cambridge leave the King Edward VII hospital in London where the Duchess of Cambridge had been admitted with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(15 of39)
Open Image ModalThe Duke of Cambridge arrives at the King Edward VII hospital in London where the Duchess of Cambridge has been admitted with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(16 of39)
Open Image ModalGeneral view of step ladders left by photographers outside the King Edward VII hospital in London where the Duchess of Cambridge has been admitted with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(17 of39)
Open Image ModalThe Duke of Cambridge arrives at the King Edward VII hospital in London where the Duchess of Cambridge has been admitted with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(18 of39)
Open Image ModalThe Duke of Cambridge enters the King Edward VII hospital in London to visit his wife, the Duchess of Cambridge has been admitted with a severe form of morning sickness. (credit:PA)
Duchess of Cambridge expecting(19 of39)
Open Image ModalPippa Middleton leaves the King Edward VII hospital in London after visiting her sister, the Duchess of Cambridge, who was admitted to the hospital on Monday with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(20 of39)
Open Image ModalPippa Middleton leaves the King Edward VII hospital in London after visiting her sister, the Duchess of Cambridge, who was admitted to the hospital on Monday with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(21 of39)
Open Image ModalPippa Middleton leaves the King Edward VII hospital in London after visiting her sister, the Duchess of Cambridge, who was admitted to the hospital on Monday with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(22 of39)
Open Image ModalThe Duke of Cambridge leaves the King Edward VII hospital in London after visiting his wife, the Duchess of Cambridge, who was admitted to the hospital on Monday with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(23 of39)
Open Image ModalThe Duke of Cambridge leaves the King Edward VII hospital in London after visiting his wife, the Duchess of Cambridge, who was admitted to the hospital on Monday with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(24 of39)
Open Image ModalNOTE ALTERNATE CROP: The Duke of Cambridge leaves the King Edward VII hospital in London after visiting his wife, the Duchess of Cambridge, who was admitted to the hospital on Monday with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(25 of39)
Open Image ModalThe Duke of Cambridge leaves the King Edward VII hospital in London after visiting his wife, the Duchess of Cambridge, who was admitted to the hospital on Monday with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(26 of39)
Open Image ModalJames Middleton leaves the King Edward VII hospital in London after visiting his sister, the Duchess of Cambridge, who was admitted to the hospital on Monday with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(27 of39)
Open Image ModalPippa Middleton leaves the King Edward VII hospital in London after visiting her sister, the Duchess of Cambridge, who was admitted to the hospital on Monday with severe morning sickness. (credit:PA)
Duchess of Cambridge expecting(28 of39)
Open Image ModalThe Duke of Cambridge leaving King Edward VII Hospital in central London after visiting his wife, the Duchess of Cambridge, who has been admitted with a severe form of morning sickness. (credit:PA)
Duchess of Cambridge expecting(29 of39)
Open Image ModalPolice officers outside King Edward VII Hospital in central London where the Duchess of Cambridge has been admitted with a severe form of morning sickness. (credit:PA)
Duchess of Cambridge expecting(30 of39)
Open Image ModalThe Duke of Cambridge leaving King Edward VII Hospital in central London after visiting his wife, the Duchess of Cambridge, who has been admitted with a severe form of morning sickness. (credit:PA)
Duchess of Cambridge expecting(31 of39)
Open Image ModalA no parking sign outside King Edward VII Hospital where the Duchess of Cambridge is being treated for acute morning sickness. (credit:PA)
Duchess of Cambridge expecting(32 of39)
Open Image ModalA well wisher outside the King Edward VII hospital in London, where The Duchess of Cambridge spent the night with severe morning sickness as the nation celebrates the news that she is pregnant. (credit:PA)
Duchess of Cambridge expecting(33 of39)
Open Image ModalThe Duke of Cambridge leaving King Edward VII Hospital in central London after visiting his wife, the Duchess of Cambridge, who has been admitted with a severe form of morning sickness. (credit:PA)
Duchess of Cambridge expecting(34 of39)
Open Image ModalThe Duke of Cambridge leaving King Edward VII Hospital in central London after visiting his wife, the Duchess of Cambridge, who has been admitted with a severe form of morning sickness. (credit:PA)
Duchess of Cambridge expecting(35 of39)
Open Image ModalPrince William leaves the King Edward VII hospital in central London where the Duchess of Cambridge has been admitted following the announcement that she is expecting a baby. (credit:PA)
Duchess of Cambridge expecting(36 of39)
Open Image ModalA general view of King Edward VII Hospital in central London where the Duchess of Cambridge has been admitted following the announcement that she is expecting a baby. (credit:PA)
Duchess of Cambridge expecting(37 of39)
Open Image ModalA general view of King Edward VII Hospital in central London where the Duchess of Cambridge has been admitted following the announcement that she is expecting a baby. (credit:PA)
Duchess of Cambridge expecting(38 of39)
Open Image ModalThe waiting media outside King Edward VII Hospital in central London where the Duchess of Cambridge has been admitted following the announcement that she is expecting a baby. (credit:PA)
Duchess of Cambridge expecting(39 of39)
Open Image ModalThe waiting media outside King Edward VII Hospital in central London where the Duchess of Cambridge has been admitted following the announcement that she is expecting a baby. (credit:PA)