The psychological thriller, which is Maggie Gyllenhaal’s directorial debut, also stars Oliva Coleman, Jessie Buckley, and Peter Sarsgaard.
Based on a book by Italian author Elena Ferrante, The Lost Daughter follows a woman on holidays (Coleman) who becomes obsessed with another woman and her daughter which prompts memories of her own early motherhood which completely unravels her.
Paul Mescal stars in the picture as Will, with Dakota Johnson playing the role of Nina.
Paul attended the screening in a blue and white shirt with light pink trousers, he paired the ensemble with white trainers.
Dakota wore a grey Camilla and Marc trouser suit and black pointed heels.
They were joined onstage after the screening at Film Independent in Los Angeles by Maggie Gyllenhaal and Peter Sarsgaard as they were interviewed by Variety's Film Awards Editor Clayton Davis.
Irish actress Jessie Buckley also stars in the film, playing the younger version of Olivia Coleman's character Leda Caruso.
25-year-old Paul was spotted with Maggie and Dakota on November 6th at Gucci’s 10th Annual LACMA ART+FILM GALA.
Paul’s rumoured girlfriend Phoebe Bridgers also attended the event. The pair made their red carpet debut, and shared loving gazes with one another.
27-year-old Phoebe is a singer-songwriter from California. The pair have been rumoured to be dating since Summer 2020. Their romance came to light when a cafe in Cork revealed that the pair had stopped by for breakfast.
The cafe in Kinsale said: "Fan-Tas-Tic day thanks to @mescal_paul and @phoebe_bridgers for calling to our café this morning for breakfast. Such amazing talented young people.”
Phoebe and Paul initially met online after they took part in a conversation together for Wonderland Magazine as the stars of summer 2020.
In an interview with GQ the following November Mescal praised a woman, believed to be Phoebe: "To have someone to lean on through such a mad, mad time has been invaluable. Really, I don’t know where I’d be without her.”
The Lost Daughter premiered on September 3rd at the Venice film festival and received a standing ovation from the audience. The film also won the Golden Osella Award for Best Screenplay at the festival.
The film will be available on Netflix from December 31st.