Like grandpa, like grandson: Onlookers often remark on their similar eyes and noses 

Both Louis and Michael, now 75, have been spotted with their heads in their hands during moments of uncertainty 

Prince Louis and Michael Middleton share unmistakable smiles and rosy cheeks 

Feeling sleepy? Louis and Michael have both been caught yawning in public 

Louis and Michael wrinkle their noses when something doesn't suit them

The grandfather and grandson display the same subtle smile 

The pair display an equally composed expression when out in public, though Louis sometimes lets his playful side escape to entertain the crowds

With an  impish glint in their eye Louis and his grandfather look sharp in suits

Unable to contain their enthusiasm, Louis and his grandad are keen to point out what they have seen to family members

 Louis and Michael are looking more alike as the prince gets older

Their resemblance is just as evident from a side profile and how they hold they hold their shoulders

They celebrate with cheers during the King's Coronation and the Rugby World Cup, respectively

Again pointing out things of interest to engage the people around them