Saoirse Ronan and Jack Lowden are dating. ‘Mary Queen of Scots’ co-stars Saoirse Ronan and Jack Lowden are reportedly dating.

They both turned up at a celebrity screening of their film Tuesday night, according to Page Six, looked very close at the after-party at Tavern on the Green .

A source told Page Six: “Jack was following her all over. He even followed her to the bathroom and was waiting outside for her. They were very close.”

Another source said: “We don’t know when they got together, we only found out on Tuesday night when they rolled up together — but they seem very happy and sweet.”

Ronan, 24, was at first believed to be dating Lowden’s ballet dancer brother Calum after the pair met at the BAFTA’s this year. But more recently, some eagle-eyed fans has spotted Ronan with Jack, 28, on holiday in the Dominican Republic and other spots.

Before filming’ Mary Queen of Scots‘, Lowden, who has also starred in ‘Dunkirk’, expressed his excitement at working with Ronan since “she’s lovely . . . I can’t wait for that it’s going to be fun.”

They didn’t stay out too late however, as Ronan had to catch a flight out of New York to resume filming ‘Little Women’, which stars Meryl Streep, Emma Watson and Timothée Chalamet.

Saoirse Ronan and Jack Lowden are dating