Holliday Grainger’s double act! Actress welcomes twins with Harry Treadaway – as the couple are seen cradling their newborns while enjoying a stroll in Devon

  • The doting parents were spotted last week enjoying a stroll with their newborns
  • Last September, it was revealed work on The Capture had been put on hold 
  • The Mail On Sunday reported the delay was due to Holliday’s pregnancy
  • It was not known until now that Holliday and Harry were expecting twins

The latest production from acting hotshots Holliday Grainger and Harry Treadaway boasts a larger cast than usual – thanks to the recent arrival of twins.

The doting parents were spotted last week enjoying a stroll with their newborns in Devon, where they moved soon after Holliday learned that she was expecting.

Last September, The Mail on Sunday revealed that work on the second series of her hit BBC drama The Capture had been put on hold due to her pregnancy.

Baby joy! The latest production from acting hotshots Holliday Grainger and Harry Treadaway boasts a larger cast than usual – thanks to the recent arrival of twins

However, it was not known until now that the 33-year-old, who also stars in the TV adaptations of J.K. Rowling’s Cormoran Strike novels, was expecting twins.

For Harry, who played Princess Margaret’s toyboy Roddy Llewellyn in The Crown, the new arrivals are an extra-special occasion as he is an identical twin himself.

The couple cradled the babies in papooses to protect them from the weather as they went window-shopping before having lunch at a small cafe.

New arrivals: The doting parents were spotted last week enjoying a stroll with their newborns in Devon, where they moved soon after Holliday learned that she was expecting

‘It was a lovely, happy family outing,’ said an onlooker. 

‘Even though both of the actors are on our TV screens all the time, no one paid them the slightest bit of attention. But the twins got a lot of admiring comments from groups of old ladies. Mum and Dad seemed delighted by that.’

Holliday and her actor boyfriend have been dating since 2015. 

Doting dad: Last September, The Mail on Sunday revealed that work on the second series of her hit BBC drama The Capture had been put on hold due to her pregnancy

Love story: Holliday and her actor boyfriend have been dating since 2015 (pictured in February 2020) 

Holliday plays Detective Inspector Rachel Carey in The Capture and stars as Strike’s sidekick Robin in the private detective series. 

Meanwhile, Harry, 36, will shortly appear as a detective in My Name Is Lizzie, Channel 4’s mini-series on the bungled undercover operation into the murder of Rachel Nickell on Wimbledon Common in 1992. 

His identical twin Luke is also an actor, seen recently in the ITV drama The Singapore Grip. 

Career: Holliday plays Detective Inspector Rachel Carey in The Capture (pictured) and stars as Strike’s sidekick Robin in the private detective series. 

Dad Harry’s a twin himself – so did that make it more likely? 

Harry Treadaway, pictured here with his cigarette-puffing twin Luke, may think having two babies together is a family tradition. But experts say his genes are unlikely to have played a part.

It is unclear if his children are identical or not. According to the NHS, a third of twins are identical, caused when a single egg is fertilised and divides in two. Such ‘monozygotic’ twins do not run in families and everyone has the same one- in-250 chance of having them.

Non-identical, ‘dizygotic’ twins occur when two separate eggs are fertilised. The resulting babies are no more alike than any other siblings.

There is a gene that makes a woman more likely to release two or more eggs during ovulation, which runs in families. Whether the father carries this gene has no bearing on whether he will have twins, but he could pass it on to a daughter, leading to the idea of twins ‘skipping a generation’.

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