When the pair began their romance, Olivia had just come out of an eight year marriage with ex Jason Sudeikis, with whom she shares two children.
Olivia stars in the film as Bunny, a married mother-of-two who loves a drink. Meanwhile, Harry portrays Jack, an ambitious workaholic alongside Florence Pugh, who plays wife Alice Chambers.
The film is a psychological thriller revolving around a married couple in the '50s whose relationship begins to suffer after Alice discovers cracks in her husband’s work life.
It comes after footage emerged of Harry refusing to stand next to his other half during a red carpet event earlier this month.
Read more on express.co.uk