Jenna Coleman and Tom Hughes are moving in together.
The 'Victoria' co-stars, both 30 - who play Queen Victoria and Prince Albert in the ITV drama - have reportedly been secretly dating for almost a year and are now viewing properties to buy together in North London.
A source told the Mail on Sunday that the couple have been looking at homes in Hampstead and added: "Jenna has been telling everyone she has fallen madly in love. She and Tom are looking for a place to buy together.
"They have been keen to keep their relationship under wraps.
"Their whole courtship has been a bit cloak-and-dagger, and they have been careful not to be photographed together."
And their chemistry has been praised by Daisy Goodwin, who wrote the 'Victoria' series.
She said: "Tom and Jenna being so close makes it easier for them to work together. They are very private about their relationship."
Jenna and Tom reportedly began dating after Jenna was linked to Prince Harry last year.
A source said: "They've been together for months, on and off since last summer.
"She chose to be with him even though Prince Harry was very keen on her.
"The reason the chemistry is so tangible is because they are dating in real life. The scenes are very real. They are completely hooked on one another."
And it has been claimed that Prince Harry unwittingly played matchmaker as his interest in Jenna made Tom ask his co-star out.
The insider explained: "Ironically Harry is largely responsible for them getting together. Jenna caught Harry's eye at the polo last year. They flirted and spent the evening together and Harry took her number and they saw each other a couple of times.
"Tom was also on the scene and made it very clear that he wasn't happy about Harry making a move on Jenna. They got together shortly afterwards."