William and Isabella Flanagan, who play Joseph Brown and Hope Stape in Coronation Street, celebrated their birthday on set this week.
The twins turned 11 on Wednesday and their dad Chris posted a sweet tribute to his son and daughter.
Taking an adorable snap of the pair, who were wrapped up against the cold in ITV-branded puffa jackets, the proud dad wrote: "Happy Birthday to these little legends, 11 years old today!
"Been a busy week but we will celebrate tonight!!"
Chris' post went down a storm with Corrie fans with many not realising the actors were related.
One wrote: "Didn't realise you were twins, happy birthday guy's hope you have a good one."
Another said: "They're twins?!! Ahh that's awesome! Had no idea! Happy birthday you two!!"
While another wrote: "Have been loving the scene’s with them both together in @itvcorrie this week fab little actors happy birthday both."
The twins have found themselves at the centre of some rather juicy storylines of late, including Joseph going awol - which left dad Chesney, played by Sam Aston, distraught.
As the search for the youngster proved fruitless fans were stunned when it was revealed Joseph's cousin Hope was helping to hide him away in the loft at her mum Fiz's house.
In Friday's episode the scheming tween kept him hidden from the search party outside.
Even the police failed to find Joseph, who ended up hiding out in a tent borrowed from Tyrone’s loft.
William and Isabella aren't the only Flanagans bitten by the acting bug.
Their older sister Amelia plays Marlon Dingle's daughter April Windsor in Emmerdale.
After finding out the Corrie actors were twins, fans thought William looked more like Amelia than Isabella.
One wrote: "You wouldn’t think Joseph and Hope were twins.. he looks more like his older sister April in #emmerdale."
Another said: "Joseph looks so like his sister in Emmerdale #Corrie," @joy9kat tweeted.
While a third posted: "Joseph in #Corrie looking exactly like his sister in #Emmerdale."
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