While Keanu looked very handsome indeed in a black tux, mum Patricia, 76, wore a crisp white suit.
And fans are obsessed with the cute gesture, with one person correctly pointing out he is "the most wholesome man in the whole of Hollywood".
We couldn't agree more.
It's not like Keanu is *always* at the Oscars either, which makes it all the more touching.
In fact, it's the first time the Matrix actor has attended an Oscars award ceremony in nine years, last making an appearance at the 2010 Academy Awards.
Tonight, Keanu - who unbelievably has never been nominated for an Oscar - will be presenting one of the 24 awards alongside other famous faces including Olivia Colman.
But the actor isn't the only person to bring their mum as plus one tonight.
Both Laura Dern and Charlize Theron brought their mums to the 92nd Academy Awards this evening. Laura - who is nominated for Best Actress in a Supporting Role for her performance in Marriage Story - arrived on the red carpet with her mum Diane Ladd.
Die hard Oscars fans will know that at the 1992 Academy Awards, both Diane - who is also an actress - and Laura were nominated for an award for the first time in its history.