Prince William represented the Queen at the State Opening of Parliament this week.
The Duke of Cambridge acted as the 96-year-old's Counsellor of State, as he followed alongside father Charles to attend the occasion.
Body language expert, Adrianne Carter, tells the Daily Star that the Duke had a visible fall in confidence at the ceremony, unlike his other public engagements.
"He is not always as confident at 'officialdom' as he is when interacting with real people."
She noted: "Charles looks like he's been ready to do this for a long time and is very natural and comfortable.
"Camilla and William looks more nervous by the way they're holding themselves and their posture."
Of the Duke, she added: "William keeps his head bowed a lot, which is a submissive way of being."
Prince William was feeling "the weight of the occasion" as he opened Parliament on the Queen's behalf alongside his father.
Earlier, body language expert Judi James noted that William felt like an 'invisible man' as he 'sadly' succumbed to his reality of having to give protocol to father.
Travis Kelce makes delightful appearance in new Netflix sequel
Katy Perry has a surprise for the Duke and Duchess of Sussex this Christmas
Kevin Jonas and Danielle Jonas are reflecting on their marriage, including their chaotic wedding
Angelina Jolie, Jennifer Aniston's poignant contrast in their approaches to relationships and friendships
Chris Diamantopoulos voiced 'Mickey' from 2013-2019
Fans speculate 2025 will be a major year for Travis Kelce