Prince Louis is set to attend his first official royal engagement next weekend.
The one-year-old will join mum Kate Middleton, dad Prince William, Prince George, five, and Princess Charlotte, four, and other senior royals at Trooping the Colour on June 8.
The annual event is held on the Queen's official birthday and has been a tradition of British infantry regiments since the 17th century.
Louis recently appeared in adorable pictures to mark the Duchess of Cambridge's garden at the Chelsea Flower Show but this will mark the tot's first proper engagement.
The youngest of the Cambridge children, who turned one in April, will ride in a carriage at the military display, the Mail on Sunday reports.
According to the newspaper, Meghan Markle will also be attending the event - her first formal appearance since giving birth to baby Archie on May 6.
It was widely reported last month that the Duchess would be returning to the spotlight at the annual event.
Meghan will appear at the royal engagement just 31 days after giving birth to baby Archie.
Last year Kate attended the spectacle on The Mall in London when her third child Louis was just seven weeks old.
Meanwhile, Donald Trump has branded comments made by the Duchess of Sussex about him as "nasty".
Meghan has been a vocal critic of the former reality TV star, backing his rival Hillary Clinton and suggesting before the 2016 election she would leave the US if he won.
In an interview with The Sun, Mr Trump said he was not aware of comments made by the duchess about him, and said: "I didn't know that. What can I say?
"I didn't know that she was nasty."
The US president begins his state visit to the UK on Monday and will meet members of the royal family, including the Queen, but new mother Meghan will not be present.
As with last year's visit, protesters are planning to take to the streets to make clear their opposition to the US leader and his policies.