ARCHIE and Lilibet are now officially a prince and princess.
Buckingham Palace has updated the Royal Family website to reflect Prince Harry and Meghan Markle's preference for their children to use the titles now Charles is King.
The couple today said it was their kids' "birthright".
The youngsters became prince and princess when the King acceded to the throne, but remained a plain "master" and "miss" on the Palace website for the past six months.
The line of succession was updated to reflect the change this morning.
Harry and Meghan's daughter Lilibet isn't the only royal to be born in the US
Archie and Lilibet now appear as Prince Archie of Sussex and Princess Lilibet of Sussex.
Harry and Meghan intend to reserve the titles for formal settings, it is understood.
Their spokesperson said: "The children's titles have been a birthright since their grandfather became monarch.
"This matter has been settled for some time in alignment with Buckingham Palace."
The duke and duchess are said to be keen to allow Archie and Lili the chance to decide for themselves whether keep using the titles when they get older.
They referred to Lilibet as a princess for the first time yesterday when confirming she had been christened last week.
It is understood the King was aware beforehand and that there had been correspondence about the matter.
A source told the Mirror: "The appropriate conversations took place ahead of Lilibet's christening."
Lili, who turns two in June, was baptised in California on Friday.
Around 25 guests gathered to celebrate the occasion - and members of the Royal Family were invited but chose not to go, PEOPLE reports.
Harry and Meghan's kids 'unlikely to get titles' after eviction row, says expert
The Sussexes allegedly asked Charles, Camilla, Prince William and Kate to be there but they declined the offer, according to a source.
Instead, the duke and duchess were joined by three-year-old Archie, Meghan's mum Doria Ragland, Lili's godfather Tyler Perry and between 20 and 30 close friends.
They are said to have enjoyed an afternoon of food and dancing following the ceremony at their home.
A spokesperson for the couple said: "I can confirm that Princess Lilibet Diana was christened on Friday, March 3 by the Archbishop of Los Angeles, the Rev John Taylor."
As the children of a sovereign's son, Archie and Lili are automatically a prince and princess and now have an HRH style if they choose.
When Archie was born in May 2019, he was seventh in line to the throne so was too far down the line of succession.
Although he was a great-grandchild of the monarch, he was not a first-born son of a future king, so was not automatically a prince.
