Duchess Kate Middleton and Prince William reveal when baby No. 3 is due

It's official, Duchess Kate and Prince William have announced when we can expect the arrival of baby number 3!

Today, Kensington Palace revealed that the new bundle of joy will be joining sister Charlotte, 2, and brother George, 4, in April 2018

Royal fans are crossing their fingers for an April 29th arrival date to help Kate and William celebrate their anniversary.

Because Kate suffers from Hyperemesis Gravidarum, Kensington Palace announced the royal pregnancy early -- only a few days into September. The condition causes severe morning sickness and dehydration, forcing the Duchess to pull out of a number of engagements, including missing Prince George's first day of school

Given Kate's state, the Palace postponed part of next month's royal tour of Norway, Sweden and Finland. Instead, Prince William will make the two-day trip to Finland alone in late November, while the two will visit Sweden and Norway in early 2018. 

Related: Inside the Duchess' maternity style: 

22 PHOTOS
Duchess Kate maternity style
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Duchess Kate maternity style
The Duchess wore her black pumps and carried a sparkly black clutch to complete her look.
The dress is a bit edgier than she typically chooses, but we loved it.
Just the tiniest hint of a bump! Kate is now 14 weeks pregnant.
The royal mom-to-be (round 2!) was glowing as she left the venue.
Kate attends the Action on Addiction Autum Gala in London on October 23, 2014, wearing a black Temperley London dress.
Kate, wearing a pale blue bespoke gown by Jenny Packham, arrives at the Natural History Museum on October 21, 2014.
The Duchess is the royal Patron of the Museum.
Kate dazzled on her first day back to royal duties since announcing her pregnancy.
The Duchess looked stunning in her floor length Jenny Packham gown.
She wore her hair down in bouncy curls with a delicate sparkly necklace.
Kate leaves the Natural History Museum.
The Duchess heads outside to present the awards of the evening.
Kate presents the Young Wildlife Photographer of the Year award to Carlos Perez Naval at the Natural History Museum.
Kate presents the Wildlife Photographer of the Year award to Michael Nichols at the Natural History Museum.
Kate leaves the Natural History Museum.
Prince William and Duchess Kate are seen as they welcome the President of Singapore Tony Tan Keng Yam at the Royal Garden Hotel on the morning of October 21, 2014. Kate is wearing a coat by Alexander McQueen and Jane Taylor hat. 
Kate's hair is pulled back in a low ponytail under her Jane Taylor hat. You can see the detail of the checked pattern of her Alexander McQueen coat.
The Duchess of Cambridge and Mary Tan depart the Royal Garden Hotel.
Kate smiles during the Horse Guards parade.
The duo prepare to meet the President of Singapore.
William and Kate laugh together during the Horse Guards Parade.
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Last month, while Prince William gave a worrisome update on her condition, he did hint that the new baby may be arriving sooner than we thought! 

"All the best with the midwifery, I may see you sooner than you think," he told a midwife at a royal engagement. 

It seems that the Duchess, however, is feeling better. Last week, she showed off her baby bump in her first engagement since the pregnancy announcement. And just yesterday, the Duchess made headlines for her adorable dance with Paddington the Bear

Related: Kate dances with Paddington

13 PHOTOS
Kate Middleton dances with Paddington Bear
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Kate Middleton dances with Paddington Bear
LONDON, ENGLAND - OCTOBER 16: Catherine, Duchess of Cambridge dances with Paddington Bear at the Charities Forum Event on board the Belmond Britigh Pullman train at Paddington Station on October 16, 2017 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - OCTOBER 16: Paddington Bear greets Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge at the Charities Forum Event on board the Belmond Britigh Pullman train at Paddington Station on October 16, 2017 in London, England. (Photo by Eamonn M. McCormack/Getty Images)
LONDON, ENGLAND - OCTOBER 16: Catherine, Duchess of Cambridge dances with Paddington Bear as she attends the Charities Forum Event on board the Belmond Britigh Pullman train at Paddington Station on October 16, 2017 in London, England. (Photo by Samir Hussein/WireImage)
Britain's Catherine, Duchess of Cambridge, (C) dances with a person in a Paddington Bear outfit by her husband Britain's Prince William, Duke of Cambridge as they attend a charities forum event at Paddington train station in London on October 16, 2017. The Duke and Duchess of Cambridge and Prince Harry joined children from the charities they support on board Belmond British Pullman train at Paddington Station. The event was hosted by STUDIOCANAL, with support from BAFTA through its BAFTA Kids programme, and before embarking Their Royal Highnesses met the cast and crew from the forthcoming film Paddington 2. / AFP PHOTO / Chris J Ratcliffe (Photo credit should read CHRIS J RATCLIFFE/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge, (C) dances with a person in a Paddington Bear outfit by her husband Britain's Prince William, Duke of Cambridge as they attend a charities forum event at Paddington train station in London on October 16, 2017. The Duke and Duchess of Cambridge and Prince Harry joined children from the charities they support on board Belmond British Pullman train at Paddington Station. The event was hosted by STUDIOCANAL, with support from BAFTA through its BAFTA Kids programme, and before embarking Their Royal Highnesses met the cast and crew from the forthcoming film Paddington 2. / AFP PHOTO / Chris J Ratcliffe (Photo credit should read CHRIS J RATCLIFFE/AFP/Getty Images)
Britain's Catherine, Duchess of Cambridge attends a charities forum event at Paddington train station in London on October 16, 2017. The Duke and Duchess of Cambridge and Prince Harry joined children from the charities they support on board Belmond British Pullman train at Paddington Station. The event was hosted by STUDIOCANAL, with support from BAFTA through its BAFTA Kids programme, and before embarking Their Royal Highnesses met the cast and crew from the forthcoming film Paddington 2. / AFP PHOTO / Chris J Ratcliffe (Photo credit should read CHRIS J RATCLIFFE/AFP/Getty Images)
LONDON, ENGLAND - OCTOBER 16: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge with Prince Harry attend the Charities Forum Event on board the Belmond Britigh Pullman train at Paddington Station on October 16, 2017 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - OCTOBER 16: Catherine, Duchess of Cambridge meets Paddington Bear at the Charities Forum Event on board the Belmond Britigh Pullman train at Paddington Station on October 16, 2017 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - OCTOBER 16: Catherine, Duchess of Cambridge attends the Charities Forum Event on board the Belmond Britigh Pullman train at Paddington Station on October 16, 2017 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, UNITED KINGDOM - OCTOBER 16 : Catherine, Duchess of Cambridge speaks to children as she attends the Charities Forum event, to join children from the charities she supports onboard the Belmond British Pullman train and to also meet the cast and crew from the forthcoming film Paddington 2 at Paddington Station on October 16, 2017. (Photo by Jonathan Brady - WPA Pool/Getty Images)
Britain's Catherine, Duchess of Cambridge, (C) laughs as she meets a person in a Paddington Bear outfit along with her husband Britain's Prince William, Duke of Cambridge, (R) as they attend a charities forum event at Paddington train station in London on October 16, 2017. The Duke and Duchess of Cambridge and Prince Harry joined children from the charities they support on board Belmond British Pullman train at Paddington Station. The event was hosted by STUDIOCANAL, with support from BAFTA through its BAFTA Kids programme, and before embarking Their Royal Highnesses met the cast and crew from the forthcoming film Paddington 2. / AFP PHOTO / Chris J Ratcliffe (Photo credit should read CHRIS J RATCLIFFE/AFP/Getty Images)
LONDON, ENGLAND - OCTOBER 16: Paddington Bear greets Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge at the Charities Forum Event on board the Belmond Britigh Pullman train at Paddington Station on October 16, 2017 in London, England. (Photo by Eamonn M. McCormack/Getty Images)
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