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THE LEMON PUCKER
"Clearly he has Mum and Dad's good looks," shares royal photographer Mark Stewart, "but I'd say that those are the Queen's rosebud lips." As with Zoolander's "Blue Steel," the "Lemon Pucker" is all in the tight pursing of the mouth. It's best saved for moments when you're displeased with Parliament or Mum won't let you wear pants to your own christening.
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THE OH, BOTHER
"When he is not smiling he looks solemn just like the Queen," observes royal watcher Jude Wade. It's true – no one does a frown quite as well as Prince George and QE II. But this look in particular is about the half-lidded eyes. These eyes convey disapproval, but not condescension. These eyes say, "Really? You want to wear that pair of pants with those shoes? I'd reconsider."
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THE STRAINED SPINACH
While Prince George clearly gets the set of his eyes and mouth from the Queen, he one-ups great granny with a wave of his fists. Not to be mistaken for the "Creamed Corn," the "Strained Spinach" is a grimace fit for only the most desperate of times – like when you've seen a polo player take a nasty fall or you really have to go to the loo.
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THE ROYAL COO
Prince George and the Queen have plenty of fierce looks, but they aren't afraid to show a tender side. Reserved for OPP (other people's playthings) or cute Corgi puppies, the "Royal Coo" will serve George well when he's kissing babies himself one day.
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THE GRUMPY CAT
The ultimate expression of dissatisfaction, the "Grumpy Cat" is set apart by the distinct furrowing of the brow. "There's something about babies who have strong eyebrows," says royal expert and author of A Century of Royal Children Ingrid Seward. "It makes them super-expressive." Right now, this look just says, "How many times have I told Mum I don't wear pink?"
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THE WINDSOR STARE-DOWN
"He's growing up, he is walking and he has big, chubby cheeks. He looks like a young Winston Churchill," says Prince Harry of his nephew. But this glare goes beyond anything the British P.M. ever leveled at his opponents. It's a royal glower that has shades of "Let them eat cake" – not. Don’t try and take away his toys on the playground.
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MORE PRINCE GEORGE
For more on Prince George's milestone birthday, including a special gatefold baby book of his first year, pick up this week's issue of PEOPLE, on newsstands Friday!