Kate Middleton
Kate Middleton glows ahead of Prince Louis's delivery. Pictured: Middleton takes part in preparations for a Commonwealth Big Lunch at St Luke's Community Centre on March 22, 2018 in London. Getty Images/Paul Edwards

Kate Middleton never lost her "glow" even when she was heavily pregnant.

On ITV's "Queen of the World" documentary, the Duchess of Cambridge and Sophie, Countess of Wessex, hosted an event and invited different designers from the Commonwealth to the Buckingham Palace. In one scene, Middleton extended her warm greetings to Euphemia-Ann Sydney-Davis, saying, "Very nice to meet you," (as quoted by Express).

The latter immediately noticed Middleton's glow. "You look fabuluous," the designer said.

Middleton gave birth to her youngest son, Prince Louis, in April. The royal mom of three had a speedy recovery. In fact, she stepped out just hours after her delivery for Prince Louis' public debut.

Middleton looked pristine when she and Prince William introduced their third bundle of joy to the public for the first time. However, while some were inspired with the duchess looking good just a few hours after delivery, there were also critics who found her to be problematic.

"You know what I find troubling is all those young women saying 'Oh, it's inspiring," Meshel Laurie said on Australian TV program "The Project." "That's not inspiring!"

"You know what would be inspiring? If when they came in her room and said 'Alright mate, up you get, hair and makeup, let's get out there' she said 'Don't be any idiot, get out! I've just had a baby!" Laurie continued.

In related news, the two-part documentary focuses on the Queen and her reign. One memorable moment in the show was the monarch making a speech, but getting interrupted by an unlikely interloper. A member of the staff asked her to repeat it from the start because there was a noisy bird. Her Majesty, who is fond of animals, just giggled and complied with their request.

A chef also revealed Queen Elizabeth II's favorite dish. According to chef Mark Flanagan, the Queen has asked to serve callaloo soup more often.

The documentary also highlighted the other members of the royal family. In the video, Prince Harry can be seen talking to a group of a group of hospitality professionals from the Caribbean who are staying in the palace. The Duke asked them if they had already met the Queen and warned them not to panic because it's normal. "I know you will. We all do!" Prince Harry said.

In the same documentary, Princess Anne also shared her thoughts about royals shaking hands with the public. She also confessed that she doesn't like people who take photos using their phones and iPads during royal visits.

"Queen of the World" premiered on ITV on Tuesday. It will air on Oct. 1 at 9 p.m. EDT on HBO in the United States.