From a body language perspective, a rarely discussed nonverbal tell is displayed here - times two.
While a "Jaw Jut" is most commonly a signal of anger, aggression and even potential physical violence - when it's clustered with other nonverbal signals - it has a completely different meaning.
As a written and/or spoken language analog, take for example the word "hot" - this word may indicate an attractive woman, a popular news subject, the spiciness of a pepper or the temperature on a summer day. These are examples of verbal homonyms. They are spelled the same and pronounced the same - yet have four completely different meanings. A twelve year-old, upon hearing four different sentences will easily discern their four respective and very different definitions. Nonverbal signals have similar communicative qualities - and thus have very different meanings depending upon the other body language signals with which they are "clustered" (those signs displayed simultaneously or nearly so) - e.g., "Nonverbal Homonyms".
Note Prince William's and Kate Middleton's upper face - each have relaxed foreheads, partially closed eyelids, concave-up furrows in their lower eyelids and upward-vectored cheek muscles - all crucial components of sincere smiles.
Now look at their jaws - both are directed forward - Kate's a fair amount more so (had the image been captured either 1/4 second earlier or later, it may very well be William's jaw jutted to a greater degree). Clustered with their upper and mid-facial sincere smiles their jaw jutting indicates pride. The royal couple are proud (and joyous) parents.
Notice no teeth are visible - surprising to many, exposure of teeth is not a required component of a Duchenne [sincere] smile.
What other valuable body language tell is being displayed in this moment which is highly applicable in your every-day? What is its specific meaning?
See also:
Nonverbal Communication Analysis No. 3173: Maryland State Attorney Marilyn Mosby - Freddie Gray's Death Ruled Homicide - charges to be pressed against police
Nonverbal Communication Analysis No. 2301: The State of the Union, Lenny Skutnik and a Body Language Signal of Being Proud
Nonverbal Communication Analysis No. 2264: Kate Middleton's First Portrait as Duchess of Cambridge Captures Body Language of Contempt, Disapproval and Fatigue
Nonverbal Communication Analysis No. 2871: Kate Middleton, Andy Murray and Wimbledon - Body Language of Empathy-Fear
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