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But the John Wick actor, 55, has made a very public statement of the seriousness of his relationship with Alexandra Grant, 46.
The Matrix actor - who has avoided public displays of affection during his 35-year-long career, held hands with the artist at the LACMA Art + Film Gala Presented By Gucci in Los Angeles on Saturday.
The cute couple posed up a storm together for the cameras, confirming their status as a two-some.
Keanu chose an elegant black suit with a black shirt and tie but kept it edgy with workman boots and facial hair.
Alexandra - with whom he collaborated on the books Ode To Happiness and Shadows - looked sophisticated in a long navy blue beaded sleeveless gown.
Swarthmore College graduate Grant smiled adoringly at the Bill and Ted star as they made their entrance at the gallery, which houses some of her work in the public collections.
The appearance confirms rumours they are a couple, after being spotted last month walking arm in arm as they left a sushi bar in West Hollywood.
The A lister was previously linked to Amanda De Cadenet, Sandra Bullock and Claire Forlani but never made a public statement on his status.
For much of the 90s, his girlfriend was actress Jennifer Syme.