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Her granddad looked smart in grey trousers and a black blazer which he teamed with a shirt and striped tie.
Michelle captioned the delightful upload: 'Happy St Patrick's Day'.
Looking back: The actress, 33, clinked her pint of Guinness against her granddad's as she smiled fondly at him and penned: 'Happy St Patrick's Day'
On Saturday, Michelle looked effortlessly chic once again as she battled the elements in a snap posted to her Instagram Story.
The actress lit up her Brassic night shoot posing under an umbrella in an ankle length white puffer parka featuring a fur-look hood.
Michelle, who plays single mum Erin Croft in the comedy, sported a second zipped puffer underneath, which she paired with a leopard-print mini.