The former costars – whose characters on the HBO series are both deceased – celebrated the premiere of Harington’s new West End production of Christopher Marlowe’s Elizabethan play Doctor Faustus at London’s The Cuckoo Club on Monday night.
Posing together at the show’s after-party, Leslie and Harington, both 29, looked polished in complementary white shirts. Harington matched his button-down with a three-piece suit, while Leslie paired her tailored shirt with slim-fitting black pants.
The pair’s Thrones cast mate Natalie Dormer was also on hand for the show’s opening and after-party.
Harington and Leslie made their red carpet debut earlier this year after first sparking rumors of a romance in January. The couple are believed to have first gotten together in 2012, but the love connection reportedly fizzled before picking up again this year.