While the couple looked loved-up on the red carpet, eagle-eyed fans noticed Alexandra was wearing a diamond ring on her wedding finger – fueling recent speculation that the couple have secretly married.
Back in April, Alexandra, an artist, was seen wearing the same diamond ring with a gold band during her and Keanu’s trip to London.
SCROLL DOWN FOR VIDEO
If the couple have secretly tied the knot, it would be Keanu’s first marriage, but any grand announcement is unlikely with the fiercely private pair known for keeping their relationship under wraps.
For the big premiere, Alexandra, 52, styled her striking ring with a plunging red dress with a ruffled neckline and glittering metallic heels.
Meanwhile, Keanu, 60, looked smart in a black suit.
Alexandra and Keanu first met at a dinner party in 2009 and collaborated on two art books together before going red-carpet official in 2019.
Wedding bells?: Fans speculated Keanu had popped the question to Alexandra…
Ever since going public, the low-key couple have attended an array of public events together, including the recent Sonic The Hedgehog 3 premiere.
During the premiere, Keanu was asked whether he regarded the event as an example of a ‘date night’ for him and Alexandra.
‘I guess it is! Yeah, we got dolled up and it’s been very exciting, and just kind of nerve-wracking in the car, but it’s really special to be side by side,’ he told Entertainment Tonight.
In 2023 Keanu shed some light on his romance with Alexandra.
When he was asked to name his ‘last moment of bliss,’ he told People: ‘A couple of days ago with my honey. We were in bed. We were connected.’
He added: ‘We were smiling and laughing and giggling. Feeling great. It was really nice to be together.’
The pair have rarely discussed details of their relationship in public.
Alexandra found herself at the end of an internet frenzy when she and Keanu went public with their relationship at the LACMA Art + Film Gala in early November 2019.
‘I think every single person I knew called me in the first week of November, and that’s fascinating,’ Alexandra told British Vogue a few months later.
When Alexandra was asked in 2020 about the prospect of marriage, she said: ‘Love at every level is deeply important to my identity. How’s that for dodging the question?’
She added: ‘I do not believe that isolation is the way. There is a period of isolation that I do as a painter, but I deeply value the experience of being in relationships.’
By the time they went official with their romance they had been friends for around a decade and it had been reported that Keanu wanted the relationship out in the open.
They first collaborated in 2011 on Keanu’s book Ode To Happiness, with Alexandra providing the illustrations.
The project marked her first book as an artist and his first as a writer.
They worked together again on the actor’s 2016 book Shadows, to which Alexandra once again contributed the artwork.
Alexandra is Keanu’s first known girlfriend since Jennifer Syme, who died in a car accident in 2001 less than four months after delivering her and Keanu’s stillborn baby.