Holliday Grainger, Harry Treadaway and their twins relax on a Devon beach

For many A-listers, a January break would mean traveling to the Caribbean for sea, sand — and lots of sunshine.

But Holliday Grainger and Harry Treadaway looked no less happy on their own family trip to the beach last week – albeit windswept and freezing.

The low-key couple enjoyed an invigorating walk at Hope Cove in Devon with their young twins, only stopping for a hot drink at a cafe, before strolling through the former fishing village.

Cold outing: Holliday Grainger and Harry Treadaway enjoyed an invigorating walk at Hope Cove in Devon with their young twins, only stopping for a hot drink at a cafe

The family bundled up against the elements, with Holliday and one of her children wearing matching burgundy woolen hats.

The 33-year-old star of TV hits Strike and The Capture once said that “the thought of being recognized on the street is petrifying” and that she and Harry, 37, are staying out of the spotlight.

They don’t use social media, rarely talk about their six-year relationship and haven’t released any details about their twins, who were believed to be born last spring.

A viewer said: ‘They were a very happy family enjoying a morning on a nearly empty beach. Both were talking to the children, who laughed back.

Labor: This comes days before Holliday begins filming on Troubled Blood, the fifth novel in JK Rowling’s Cormoran Strike series. Pictured: Starring in the adaptation of the fourth novel Lethal White

“The twins appeared to be a boy and a girl and at one point it looked like they were playing some kind of tag game – girls against boys.

“Despite the fame of their parents, no one paid any attention to them.”

The trip comes days before Holliday begins filming Troubled Blood, the fifth novel in JK Rowling’s Cormoran Strike series.

The couple will also soon appear together in the film Halo of Stars, based on a poem by Anthony Lucero, The Clown.