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.
Liam Payne laid to rest on November 20
King Charles III seemingly sends a hidden message to Prince Harry
Kelsea Ballerini peforms country duet with Noah Kahan at award celebration
Katie Price breaks silence as she denies claims of ninth marriage proposal
Selena Gomez has released two singles in the past year after her 2020 chart-topping album 'Rare'
Jin promotes solo album 'Happy' at 'The Tonight Show' with Jimmy Fallon