They’ve been dabbed the ‘royal fab four’ but reports at the end of last year alleged there was a strain in the relationship between the Duke and Duchess of Cambridge and the Duke and Duchess of Sussex.

Although the royal foursome has not attended events often together since then, royal fans have a kept a keen eye on the family, who all appeared together last week to mark the 50-year anniversary of the investiture of Prince Charles becoming the Prince of Wales.

More recently, they all came together again for the Commonwealth Day celebrations in London on Monday.

The only factors royal fans are able to speculate on from the outside is Duchess Kate’s and Duchess Meghan’s body language. The question arises: What does the fab four’s body language tell us about the supposed feud?

Kirsty Milligan, a body language expert, told Yahoo Lifestyle that if there is a "feud", the royal family are good at hiding it from the public and keeping it purely behind closed doors.

“The ‘Fab Four’ are definitely well versed in how to maintain a professional/regal presence in public,” she said.

“If there is a rift, they’re very practiced in not allowing that to show.

“We can usually see this in facial expressions and guarded or protective body movements that show discomfort.”

Through analysing the behaviour of the Dukes and Duchesses at Buckingham Palace last week, Milligan added: “What we can see of their facial expressions is very composed. This could certainly be masking many other feelings and emotions.

“We do see a very polished and practiced public appearance, but it’s what we don’t see that might be more telling.”

Elly Johnson, another body language professional, believed the 37-year-old Duchess of Sussex had other thoughts on her mind that are actually quite far away from the alleged "rift".

Speaking on the public appearance last week, Johnson said: “I believe Meghan is more focussed on figuring out exactly what she should do and when they should walk in, she is feeling a bit awkward, not having attended an event exactly like this before.”

She also explained the Duke and Duchess of Sussex are both aware of an order that should be “respected” in the royal family and are “conscious not to lead the way into the room".

Do you believe the reports that there is a rift between the Duke and Duchess of Cambridge and the Duke and Duchess of Sussex? Let us know in the comments below.