On Monday, Stiles’ rep confirmed to PEOPLE exclusively that the star and her fiancé, Preston J. Cook, will welcome their first child later this year.
The couple met on the set of 2015’s Go with Me, where Cook worked as a camera assistant. The pair got engaged on Christmas Eve 2015.
Stiles has been in London promoting Riviera, an upcoming 10-part thriller series airing on the U.K.’s Sky Atlantic.
Riviera premieres Thursday, June 15.