On Thursday, the actors were seen enjoying a leisurely stroll walking a dog, during which Bohemian Rhapsody star Malek, 42, leaned in and kissed Corrin, 27.
The pair, whose day out was captured in snaps published by Daily Mail, have been seen enjoying each other’s company on numerous occasions over the past few weeks.
They first sparked romance rumours, when they were seen together having dinner in Margate, Kent. Then in July, they attended Bruce Springsteen’s concert at London’s Hyde Park, and were seen earlier this month at the US Open where they sat beside each other.
It’s not known how the two met or how much longer Malek will be staying in London with his rumoured girlfriend.
The star, who bagged an Oscar for his best known role as Freddie Mercury, split from his girlfriend of five years Bohemian Rhapsody co-star Lucy Boynton.
He has also appeared as the villain in the 2022 James Bond film No Time To Die and this year’s Christopher Nolan epic Oppenheimer.
Corrin, who identifies as nonbinary, became famous for their portrayal of Princess Diana in the fourth season of Netflix drama series The Crown, for which they won a Golden Globe.
They’ve also appeared in the Netflix adaptation of Lady Chatterley’s Lover and alongside Harry Styles in the film, My Policeman.
Evening Standard Online has contacted representatives for both stars for comment.