Duchess Kate 'highly unlikely' to be well enough to take Prince George to his first day of school

Prince George is set to start his first day of school tomorrow, but it's "highly unlikely" that his mother Duchess Kate will be able to drop him off on his big day, according to a royal source.

Kensington Palace announced earlier this week that the 35-year-old royal is pregnant with baby No. 3 and that she's been suffering from severe morning sickness that plagued her first two pregnancies. The condition, known as Hyperemesis gravidarum, affects about one in every 200 pregnancies and results in severe nausea, dehydration, and low blood pressure.

"As with her previous two pregnancies, The Duchess is suffering from Hyperemesis gravidarum. Her Royal Highness will no longer carry out her planned engagement at the Hornsey Road Children's Centre in London today," the statement said.

72 PHOTOS
The best photos of Prince George
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The best photos of Prince George

Prince George onboard a plane after leaving the Royal Tour of Canada.

October 2016

Photo: Mark Large/Daily Mail/PA Wire

Prince George at Warsaw's Chopin Airport with the Duke and Duchess of Cambridge and Princess Charlotte at the start of their five-day tour of Poland and Germany.

George hams it up for the cameras.

October 2016

Photo: Andrew Milligan/PA Wire

George is like "... uhhh come ON Mom and Dad!"

October 2016

Photo: Mark Large/Daily Mail/PA Wire

George adorably waves to the cameras as he and his family leave Canada following their royal tour.

October 2016

Photo: Andrew Milligan/PA Wire

Prince William with his son Prince George at a children's party for Military families in Victoria, Canada.

October 2016

Photo: Chris Jackson/PA Wire

Prince George plays with bubbles at a children's party for Military families in Canada.

October 2016

Photo: Chris Jackson/PA Wire

Prince George fascinated with bubbles at the children's party in Canada.

October 2016

Photo: Chris Jackson/PA Wire

He. Is. Too. Cute.

October 2016

Photo: Chris Jackson/PA Wire

Hmmm, not so sure about those cameras, Mom.

September 2016

Photo: Andrew Milligan/PA Wire

Prince George lands in Canada, holding his dad's hand.

September 2016

Photo: Andrew Milligan/PA Wire

Handout photo, taken by his mother, the Duchess of Cambridge, of Prince George on his first day at the Westacre Montessori nursery school near Sandringham in Norfolk.
Handout photo, taken by his mother, the Duchess of Cambridge, of Prince George on his first day at the Westacre Montessori nursery school near Sandringham in Norfolk.

Prince William carries George as they leave Charlotte's christening.

July 2015

Photo: Matt Dunham - WPA Pool/Getty Images

Prince George makes a face at the camera as he celebrates his little sister's big day.

July 2015

Photo: Chris Jackson/Getty Images

Prince William hold George's hand as they walk to the church.

July 2015

Photo: Chris Jackson/Getty Images

Curious George peers over his shoulder at the crowds nearby.

July 2015

Photo: Chris Jackson/Getty Images

Kate and George play while watching Prince William in a polo match.

June 2015

Photo: Chris Jackson/Getty Images

Prince George chats with his dad William after the match, with his grandfather Charles looking on.

June 2015

Photo: Chris Jackson/Getty Images

Prince George makes his balcony debut! He sits in his dad's arms during the Trooping the Colour to celebrate the Queen's birthday.

June 2015

Photo: Chris Jackson/Getty Images

George watches his mom and dad arrive during the Trooping parade, having a lot of fun with his nanny Maria.

June 2015

Photo: Chris Jackson/Getty Images

The little Prince has mastered the royal wave!

June 2015

Photo: Chris Jackson/Getty Images

George has fun watching the parade.

June 2015

Photo: Chris Jackson/Getty Images

George gives a final wave to his adoring public.

June 2015

Photo: Chris Jackson/Getty Images

Prince George holds his newborn baby sister, her first official photos, photographed by Duchess Kate herself.

May 2015

Photo: HRH The Duchess of Cambridge via Getty Images

George gives Charlotte a kiss -- too cute!

May 2015

Photo: HRH The Duchess of Cambridge via Getty Images

On the day Princess Charlotte was born, Prince William ran to pick up his son to visit his little sister.

May 2015

Photo: Chris Jackson/Getty Images

George gets a kiss from dad as they entered the Lindo Wing at St. Mary's hospital. 

Photo: Chris Jackson/Getty Images

William tries to walk with George -- who just wanted to be carried! -- as they visit Charlotte and Kate. 

Photo: JUSTIN TALLIS/AFP/Getty Images

Christmas photographs of Prince George sitting on the Kensington Palace steps, released by his proud parents William and Kate. 

November 2014

Photo: Handout via Getty Images

Christmas photographs of Prince George sitting on the Kensington Palace steps, released by his proud parents William and Kate. 

November 2014

Photo: Handout via Getty Images

Christmas photographs of Prince George sitting on the Kensington Palace steps, released by his proud parents William and Kate. 

November 2014

Photo: Handout via Getty Images

Prince George was up on his feet watching William play polo on Father's Day. 

June 2014

Photo: Max Mumby/Indigo via Getty Images

Kate holds wiggly George at the polo match.

June 2014

Photo: Getty Images

"Okay bye mom!" 

June 2014

Photo: Max Mumby/Indigo via Getty Images

"Um Mom, who is this lady?" 

April 2014

Photo: WireImage

The always fashionable George was decked out in red for the last day of the royal tour. 

April 2014

Photo: WireImage

"Wait! I think I dropped my toy - no seriously, I can see it from here!" 

April 2014

Photo: Chris Jackson via Getty Images

This cutie touches down in Australia's capital. 

April 2014

Photo: Cole Bennetts via Getty Images

William, Kate and George visited the Taronga Zoo in Sydney and George got to meet a bilby! He was really excited about it. 

April 2014

Photo: Chris Jackson via Getty Images

Just a dad and his boy!

April 2014

Photo: Getty Images

Testing out his Princely roar.

April 2014

Photo: Getty Images

Just look at those chubby little cheeks!

April 2014

Photo: Samir Hussein via Getty Images

We couldn't help but laugh out loud at George's mean mug right here.

April 2014

Photo: Samir Hussein via Getty Images

Playing with his toy bilby.

April 2014

Photo: Getty Images

"Okay mom. It's really bright out here... AND I'm wearing ruffles. Can we talk about this?"

April 2014

Photo: Samir Hussein via Getty Images

"What's up, Australia?"

April 2014

Photo: Getty Images

Ah, the Princely handshake.

April 2014

Photo: Getty Images

We're obsessed with William and George's matching fly-away hair as they left New Zealand.

April 2014

Photo: Getty Images

Looks like it's nap o'clock!

April 2014

Photo: Getty Images

"Here, mom, let me help you."

April 2014

Photo: Getty Images

Too cute for words.

April 2014

Photo: AFP/Getty Images

This photo is Kate's favorite from their royal tour, where baby George had just woken up from his nap and was so happy to hug his mom.

April 2014

Photo: Getty Images

Little George during his New Zealand playdate!

April 2014

Photo: Getty Images

Baby George arrives in New Zealand.

April 2014

Photo: WireImage

This photo might just be our favorite -- Georgie looks like he's trying to dive out of Kate's arms! Good thing she has a solid grip.

April 2014

Photo: WireImage

Such a cutie!

April 2014

Photo: WireImage

The palace released this official photo just a week before the family takes off for Australia and New Zealand. Oh how he's grown! Cutie George gazes at his pup, Lupo (in a dashing sweater with his name on it).

March 2014

Photo: Jason Bell/Camera Press/Redux

Kate and William proudly presented George on his christening day.

October 2013

Photo: Getty Images

Quite the outfit, Georgie!

October 2013

Photo: Getty Images

William and George.

October 2013

Photo: AFP/Getty Images

William and George.

October 2013

Photo: Getty Images

Kate, in Alexander McQueen, and George in the royal christening dress.

October 2013

Photo: Getty Images

Kate and George.

October 2013

Photo: Getty Images

George's first official portrait! Lupo got to be in this one, too. 

August 2013

Photo: Getty Images

Kate debuts her son, Prince George Alexander Louis of Cambridge.

July 2013

Photo: Getty Images

Kate, William and George.

July 2013

Photo: Getty Images

Kate, William and George.

July 2013

Photo: Getty Images

Kate wore a simple, pretty, polka-dotted dress by Jenny Packham.

July 2013

Photo: FilmMagic

William carries George to the car.

July 2013

Photo: Getty Images

Cutie heads home!

July 2013

Photo: Max Mumby/Indigo/Getty Images

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A previous Kensington Palace statement released last week revealed the original plan for George's first day at St. Thomas's Battersea: "The Duke and Duchess of Cambridge, accompanying Prince George, will be met on arrival at the school by the Head of Lower School, Helen Haslem, who will then escort Their Royal Highnesses to Prince George's reception classroom."

Unfortunately, it seems as if plans have changed due to Kate's condition.

"The Duchess wanted more than anything to be there. It's a big day for her son. But she has been really very sick this week," the source added.

She was also forced to pull out of two public engagements on Monday and Tuesday.

RELATED: See photos of Prince George's adorable meltdown:

15 PHOTOS
Prince George's meltdown
See Gallery
Prince George's meltdown
FAIRFORD, ENGLAND - JULY 08: Prince George of Cambridge and Catherine, Duchess of Cambridge during a visit to The Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
FAIRFORD, WALES - JULY 08: Catherine, Duchess of Cambridge and Prince George during a visit to the Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England. (Photo by Chris Jackson/Getty Images)
FAIRFORD, WALES - JULY 08: Prince George is comforted by Catherine, Duchess of Cambridge as he rubs his eyes after sitting in a ''Squirrel'' helicopter similar to the one that his father trained on during a visit to the Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England. (Photo by Richard Pohle - WPA Pool/Getty Images)
Britain's Prince George wears ear defenders as he visits the Royal International Air Tattoo at RAF Fairford in western England, on July 8, 2016, with his mother Catherine, Duchess of Cambridge, (Pictured) and father Prince William. / AFP / POOL / RICHARD POHLE (Photo credit should read RICHARD POHLE/AFP/Getty Images)
FAIRFORD, ENGLAND - JULY 08: Prince George of Cambridge attends the The Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England. (Photo by Samir Hussein/WireImage)
Prince George is told off for running away from him by Prince William during a visit to the Royal international air tattoo at RAF Fairford, Britain July 8, 2016. REUTERS/Richard Pohle/Pool
FAIRFORD, WALES - JULY 08: Catherine, Duchess of Cambridge and Prince Willliam, Duke of Cambridge points out low flying planes to his son Prince George during a visit to the Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England. (Photo by Richard Pohle - WPA Pool/Getty Images)
Prince George and the Duchess of Cambridge meet members of the red arrows display team during a visit to the Royal international air tattoo at RAF Fairford, Britain July 8, 2016. REUTERS/Richard Pohle/Pool
Prince George beckons for his mother after being lifted out of a Squirrel helicopter similar to the one that his father Prince william trained on as he visits the Royal international air tattoo at RAF Fairford, Britain July 8, 2016. REUTERS/Richard Pohle/Pool
FAIRFORD, WALES - JULY 08: Catherine, Duchess of Cambridge and Prince George during a visit to the Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England. (Photo by Chris Jackson/Getty Images)
FAIRFORD, WALES - JULY 08: Catherine, Duchess of Cambridge and Prince George during a visit to the Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England. (Photo by Chris Jackson/Getty Images)
FAIRFORD, WALES - JULY 08: Catherine, Duchess of Cambridge and Prince George during a visit to the Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England. (Photo by Chris Jackson/Getty Images)
FAIRFORD, WALES - JULY 08: Catherine, Duchess of Cambridge and Prince George during a visit to the Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England. (Photo by Richard Pohle - WPA Pool/Getty Images)
FAIRFORD, WALES - JULY 08: Catherine, Duchess of Cambridge and Prince George during a visit to the Royal International Air Tattoo at RAF Fairford on July 8, 2016 in Fairford, England. (Photo by Chris Jackson/Getty Images)
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Earlier this week, Prince William spoke publicly about Kate's pregnancy for the first time, revealing that "there's not much sleep going on at the moment."

Despite Kate's absence, we're sure that George's first day will be a special day for the royal family. Of course, we can't wait for the adorable photos of the prince! Check out the slideshow above for the cutest photos of George.

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