Fans loved the photo as Danny awarded his dad and brother with the 'best Halloween costume' of the year
"Well suited, love it," one follower commented.
"Omg this is amazing," a second wrote.
"This is brilliant," a third added.
The hilarious post comes after it was confirmed that the Mrs Brown's Boys Christmas specials wrapped up filming.
There was doubt over whether the Covid-19 pandemic would halt production of the festive TV favourite, but the two episodes will broadcast as normal this Christmas.
Back in September, Danny - who plays the role of Buster Brady - tweeted: "Just got the shooting dates for Mrs Browns Boys Christmas Specials. WE’RE BACK!"
And Dermot O'Neill, who plays the role of Grandad, confirmed that the episodes were completed last month.
"We're all home now in Dublin and self-isolating for the next ten days," he told The Irish Sun at the time.
"But the shows are in the bag and we hope it gives everyone a big laugh. It's what we all need."
Of course, extra safety and hygiene measures were put in place to make sure the set stayed Covid-free while filming took place.
Dermot added: "You'd have a Covid test on Monday morning and then you'd find out on Wednesday if you were clear.
"God knows what would have happened if anyone tested positive but thankfully we were all clear and we were able to keep going."