Game of Thrones stars Kit Harington and Rose Leslie have made their red carpet debut as a couple.

The pair, which also played love interests on the hit show, were both killed off in previous seasons, although Harington is pitted to return in some capacity in season six.

Attending the Olivier Awards together in London, Harington and Leslie looked loved up as they laughed, held hands and shared a kiss for the cameras.

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Attending the Olivier Awards together in London, Harington and Leslie looked loved up as they laughed, held hands and shared a kiss for the cameras.

The pair wasn’t holding back for the cameras. Photo: Getty/Supplied

There have been rumours of a romance between the pair since 2012, but this is the first time they have appeared at an official event together.

“Kit is a lovely and funny man, and a dear friend,” she told People Magazine in 2014.

“We had known each other before we started working together on Game of Thrones.

“It was always such a privilege to be working opposite him and such a blessing that we get on in real life because it made our characters more believable.”

In seasons two, three and four of GoT, Leslie played the wildling Ygritte, who came to love Harington’s character Jon Snow and eventually died to save him.

The Scot, who grew up in an Aberdeen castle with her aristocratic family, has also appeared in Downton Abbey and the BBC detective series Luther.

Harington meanwhile has appeared in the film How to Train Your Dragon 2 and will soon appear on stage in the play Doctor Faustus.