The unnamed son will be fifth-in-line to the British throne, behind her grandfather Prince Charles, father Prince William, brother Prince George and big sister Princess Charlotte.
Kate's last public event was a visit to Wimbledon on Friday in her role as patron of the All England Lawn Tennis Club and a keen tennis fan.
Catherine, Princess of Wales, made a heartfelt return to Centre Court on Saturday, surprising and delighting fans at the Wimbledon women's final-her first at the event since revealing her cancer diagnosis.
Turns out Kate Middleton is quite like many of us -- fuss-free sales shopper and loves to bargain!
The Duchess of Cambridge, Catherine, turned up at the Commonwealth Games in Glasgow on Monday.
Wildcard Harriet Dart was probably surprised, therefore, when she looked up to see the Duchess of Cambridge sat in the front row of seats on Court 14 on Tuesday.
Britain's Prince William and his wife Duchess of Cambridge, Catherine were in the Royal Box as the defending champion Andy Murray was dethroned out of Wimbledon on Wednesday.
The young royal couple was the guest of honour at War Horse's UK premiere.
Kate Middleton, the Duchess of Cambridge, didn't mind getting her hands -- or boots -- dirty when she joined schoolchildren on a camping trip on Monday.
Prince William and his bride Kate Middleton were bestowed with the titles Duke and Duchess of Cambridge on the day of their wedding in April 2011.
Experts predict she will have swelled the coffers by 1 billion (Rs 9,633 crore) before she is 10.
They may be half a world away from each other, but former commoners Catherine, Duchess of Cambridge and Queen of Bhutan Jetsun Pema have a lot more in common than one would imagine!
The Duke and Duchess of Cambridge Prince William and Kate Middleton arrived in Mumbai on Sunday as part of their seven-day tour of India and Bhutan, aimed at building up strong bonds with the two countries.
The young royal was urged to not drop the prized Wimbledon trophy by his father after being handed the trophy by Djokovic.
A look back at many memorable moments in his life as Prince Charles.
The Royal couple made perfect round rotis with a little assistance.
Kate Middleton, the Duchess of Cambridge, arrived for the first day of Wimbledon on Monday with a dramatic new hairstyle to watch Andy Murray play his opening match.
Rybakina barely put a foot wrong as she recovered from a nervous start against the wily Tunisian.
There were big names in the stands as England beat Denmark in penalties to reach the Euro 2020 final on Wednesday.
The Duke and Duchess of Cambridge, Prince William and Kate Middleton took time during their trip to New York to attend an NBA game.
The royal couple, who are on a five-day tour of Pakistan, took a ride in a decorated rickshaw fitted with lights to arrive at the venue of the dinner.
Meghan Markle and Kate Middleton were spotted.
Kensington Palace has released four new pictures of the youngest member of the royal family.
The touching snaps -- taken by his mother, the Duchess of Cambridge, and released on Saturday -- are the first glimpses of the British Prince since he was taken home from St Mary's Hospital where he was born 13 days ago.
The Duke and Duchess of Cambridge, both 37, will visit the country shrugging off security fears to follow in the footsteps of William's grandparents, father and late mother, Princess Diana.
Famous faces spotted at the finals:
The newly-minted Duchess of Sussex chose Kate's favourite designers for her first royal outing post marriage.
The Duke and Duchess of Cambridge emerged from the exclusive maternity unit at St Mary's Hospital after giving birth to a healthy son.
Kate Middleton and Prince William are expecting their second child, drawing congratulatory messages for the popular British Royal couple.
The 96-year-old monarch has been suffering from age-related mobility issues and has cut down her travels, including appointing new Prime Minister Liz Truss in Scotland earlier this week.
Kensington Palace published three pictures taken recently by his mother, the Duchess of Cambridge.
The wait for Prince William's second baby was finally over as his wife Kate Middleton, the Duchess of Cambridge, on Saturday gave birth to a baby girl.
Right ahead of her first India tour, the Duchess of Cambridge Kate Middleton showed us how to dress diplomatically!
William, the Duke of Cambridge, also revealed that he had not spoken to his younger brother Harry since the interview was first broadcast over the weekend but plans to do so.
Lili is the first of the Queen's great-grandchildren to be born outside the United Kingdom as Harry and Meghan relocated to California in the US last year after they stepped back as frontline royals.
Whether rowing or greeting a head of state, Kate Middleton got it right every time on the latest royal tour.
The royals visited a drop-in centre for charity Salaam Baalak at a Delhi train station - where around 6,600 children travel to each year, during their third day of their India tour.
The royal couple's first child, who under new laws to succession will remain third in line to the throne, was born with the Duke of Cambridge present beside Kate as she delivered the baby.
Jamaican sprint superstar Usain Bolt has reportedly branded the ongoing Commonwealth Games in Glasgow as a 'bit s***' and said that the Olympics were 'better'.