The one thing missing from Prince Archie's new birthday photo posted by Meghan Markle

is celebrating his sixth birthday today, with his mum Meghan Markle uploading a new photograph of the young prince to mark the occasion. In the sweet picture, Archie can be seen in what appears to be pyjamas as

The Duchess of Sussex, 43, who rejoined social media this year, five years after quitting the Royal Family with captioned the photograph with a sweet message. She wrote: "Our son. Our sun. Happy 6th birthday to Archie! Thank you for all of the love, prayers, and warm wishes for our sweet boy. He's six! Where did the time go? (And for all of you who came to celebrate with us at his party last weekend, thank you for making his birthday so incredibly special)." However, it appears that there is one thing missing in the post, which was uploaded on Tuesday.

While Meghan, 43, refers to her son by his first name Archie in the post, she does not refer to him by his royal title, which is

This could come as a surprise to some, and may led to questions as to whether she has decided not to use her son's royal title after Prince Harry's bombshell , in which he claimed his father King Charles no longer speaks to him.

The duke's interview came after - which was reduced in 2020 - in the UK to return to what it was when he was a working royal. This is despite the fact he quit life as a working royal in 2020 and moved to the US.

As well as suggesting that , Harry also admitted that he

The prince told the BBC: "Everybody knew that they were putting us at risk in 2020 and they hoped that me knowing that risk would force us to come back. But then when you realise that didn't work, do you not want to keep us safe?"

In response to Harry's BBC interview, : "All of these issues have been examined repeatedly and meticulously by the courts, with the same conclusion reached on each occasion."

It is not known whether any members of the Royal Family have wished Prince Archie a happy birthday privately.

No members of the Royal Family are believed to have flown to Montecito in California - where Meghan and Harry have lived since 2020 - to attend the young royal's birthday party.