Kensington Palace has confirmed that the Duchess of Cambridge was admitted to St Mary's Hospital, Paddington, ahead of the birth of her third child.
The Duchess will give birth at the Lindo Wing of St Mary’s Hospital, where she also welcomed her first two children, Prince George, four, and two-year-old Princess Charlotte.
"Her Royal Highness The Duchess of Cambridge was admitted to St. Mary's Hospital, Paddington, London earlier this morning in the early stages of labour," a tweet from Kensington Palace's official account confirmed, adding "The Duchess travelled by car from Kensington Palace to the Lindo Wing at St. Mary's Hospital with the Duke of Cambridge."
GALLERY: Here's everyone expecting a baby this year...
Pregnant Celebs 2019 Closer - SLIDER & STACKED USE THIS ONE
1 of 16Marnie Simpson and Casey Johnson
Marnie Simpson announced she was pregnant with her first child with boyfriend Casey Johnson in April, after fearing she was infertile.
2 of 16Gemma Atkinson and Gorka Marquez
Strictly Come Dancing love birds Gorka Marquez and Gemma Atkinson announced their pregnancy with an adorable instagram snap of their two pups Norman and Ollie with signs around their necks saying "Guess what... Mum's pregnant! We're going to be big brothers!"Aww!
3 of 16Jess Hayes and Dan Lawry
Love Island winner Jess Hayes announced she's pregnant with her first child with Dan Lawry, and the happy couple are expecting in July.
4 of 16Myleene Klass and Simon Motson
Former Hear'Say singer and TV presenter Myleene Klass has announced that she is pregnant with her third child.Myleene, 40, revealed the happy news on Instagram on Valentines Day with an adorable photo of her baby bump with the simple caption '❤ufe0f'.This will be Myleene's third child but her first with her partner Simon Motson. Myleene already has daughters, Ava, 11 and Hero, 7.
5 of 16Hayley Tamaddon
Actress Hayley Tamaddon, who's starred in Emmerdale and Corrie, announced she's expecting her first child - age 42!"I'm so pleased to tell you all... I'm expecting my first child with my wonderful boyfriend Adrian!!" she said. "I've always wanted to be a mum and didn't think I could have children. And now, at the ripe old age of 42 - I'M PREGNANT! And We couldn't be happier. "
6 of 16Chloe Lewis
Chloe Lewis announced her pregnancy with boyfriend Danny Flasher in May, with a v. cute Instagram post.
7 of 16Rachel Riley and Pasha Kovalev
Strictly Come Dancing lovers Rachel Riley and Pasha Kovalev announced they'd be having their first child in May.
8 of 16Julia Goudling and Ben Silver
Congrats are in order for Coronation Street actor Julia Goulding and her husband Ben Silver who are expecting their first child – just three months after getting married.
9 of 16Hannah Elizabeth
Original Love Islander Hannah Elizabeth has been celebrating her pregnancy with some very racy lingerie snaps. She made her announcement in May.
10 of 16Malia Arkian
Most famous for getting ejected from the Love Island villa just HOURS after arriving in 2016, Malia Arkian announced in June that she was expecting her first child with, and was engaged to, her footballer boyfriend Hope Akpan.
11 of 16Helen Briggs and Chet Johnson
One of the only successful couples to have come from Ex on the Beach, Helen Briggs and Chet Johnson, have announced their first pregnancy with a really gorgeous snap on Instagram. "Half me, half you," wrote Helen, alongside the post.
12 of 16Anna Willamson and Alex Di Pasquale
Anna Williamson announced her second pregnancy with husband Alex Di Pasquale with a gorgeous cover shoot with OK! magazine. "I'm not getting any younger, so when we discovered I was pregnant, we were so pleased," she said.
13 of 16Jeremy McConnell and Katie McCreath
Jeremy McConnell's girlfriend Katie McCreath confirmed she's expecting their first child together (and Jeremy's second) a week after Jeremy made his own announcement on Instagramwhich he then claimed was "a prank".
14 of 16Joe Wicks and Rosie Jones
Joe Wicks announced he was expecting his second child with wife Rosie Jones with a lovely family snap on Instagram which showed off Rosie's 19-week bump. "We are very happy and excited to grow our family," he said.
15 of 16Jeremy Kyle and Vicky Burton
Jeremy Kyle announced he was going to be a dad again in August, to his first child with girlfriend Vicky Burton, following the axing of his daytime TV show.
16 of 16Aaron announced he was expecting his first child with girlfriend Talia Oatway, with some beautiful family portraits of them together along with Talia's daughter, who Aaron's played step-dad to since they got together two years ago. The shock announcement came just days after reports the couple had split as they unfollowed each other on social media.
Aaron announced he was expecting his first child with girlfriend Talia Oatway, with some beautiful family portraits of them together along with Talia's daughter, who Aaron's played step-dad to since they got together two years ago.The shock announcement came just days after reports the couple had split as they unfollowed each other on social media.
The Duchess announced her pregnancy on 4 September 2017, two and a half years after the birth of Princess Charlotte.
She was forced to announce her pregnancy before the standard three-month mark after suffering from hyperemesis gravidarum, the condition that gives her severe morning sickness.
Her illness meant that she had to pull out of a public appearance at the last minute, with the palace explaining that her new pregnancy was the cause.
The baby will be fifth-in-line to the throne, following its elder siblings, father and grandfather, with Prince Harry now dropping to sixth position.
Ahead of the birth of the Duke and Duchess’s first child Prince George in 2014, the law of succession was changed so that if the baby was a girl, she could succeed to the throne ahead of any younger brothers.
Due to this change in the law, the new baby was always going to follow Princess Charlotte in the line of succession.
The birth comes just weeks ahead of the upcoming royal wedding of Prince Harry and Meghan Markle, due to take place at Windsor Castle on 19 May.