The pair have spent the last few weeks filming My Policeman, adapted from the novel of the same name, which sees Emma portraying a woman who marries a police officer, played by the Grammy-winning singer, who is secretly having a relationship with another man.
As she celebrated the end of filming, the star of The Crown posted a series of photos on her Instagram page.
“Aaaaand that’s a falafel wrap baaaaby,” she wrote, alongside a picture of herself and Harry – whose array of tattoos were covered by makeup – sitting by the side of a swimming pool.
Another picture showed Emma cosying up to co-star David Dawson on a park bench, while the third saw her face hovering over a picture of David with Harry and director Michael Grandage.
My Policeman will also feature Gina McKee, Linus Roache and Rupert Everett as older versions of Emma, Harry and David’s characters, respectively.
Emma rose to international stardom last year when she made her debut as Princess Diana in the fourth series of Netflix’s The Crown, a role which earned her a Golden Globe and a Critics’ Choice Award.
She’ll next be seen in My Policeman, although she’s also set to take the lead in the play Anna X which arrives in London’s West End next month.
Harry is obviously best known for his illustrious singing career, which began in the boyband One Direction, but he made his acting debut in the film Dunkirk in 2017.
He’s also set to appear in the psychological thriller Don’t Worry Darling, the director of which, Olivia Wilde, he began dating last year.