Holliday Grainger and her long-time boyfriend Harry Treadaway have welcomed twins into the world

The babies were carried by their mother and father - who first started dating in 2015 - in papooses as they enjoyed a family day out.

An onlooker told the newspaper: "It was a lovely, happy family outing.

"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."

Last year, it was reported that Holliday had postponed work on her BBC series 'The Capture' when she found out she was expecting.

Meanwhile, the 'My Cousin Rachel' actress previously admitted she has grown more "selective" with her career as she's got more successful.

She said: "I'm getting more selective, the more I do. As an actor, you want to do a variety of things, but first and foremost, it's the script, the quality of the script and the part.

"If the script is great and it's a part that I believe and I believe the world, that's rarer than you think. It's always a project that I want to be involved in, if it's a world that I believe. As an actor, when you're put into a world that you believe, you're given the freedom to do what you want with the character."