AceShowbiz - Is new Hollywood couple born? "Mary Queen of Scots" co-stars Saoirse Ronan and Jack Lowden get people wonder if they are bringing their on-screen romance to real life after attending an event together.

The 24-year-old three-time Oscar nominee and the "Dunkirk" star showed up together at the movie's New York City screening at Cinema Society on December 5. In addition, the two stars posed side-by-side on the red carpet.

Further fueling the speculation, the alleged new couple was said to be getting cozy to each other at the screening's afterparty which took place at Tavern on the Green in Central Park. It seemed like the two refused to be separated as a source claimed to Page Six, "Jack was following [Saoirse] all over."

"He even followed her to the bathroom and was waiting outside for her. They were very close," added the source. Another source who apparently worked on the movie went on saying, "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."

Saoirse and Jack were spotted having a vacay together in the Dominican Republican earlier this year. Jack also seemingly had set his eyes on the actress way before working together in "Mary Queen of Scots". The actor once gushed over Saoirse in an interview, saying, "She's lovely...," adding that he couldn't wait for working together for the movie because "it's going to be fun."

Should Saoirse and Jack be dating, it will be interesting since the actress was previously romantically linked to Jack's brother, Calum. They were rumored to be dating after she and the ballet dancer met at the 2018 BAFTAs.