The pair ate at top eatery Craig’s but left separately to avoid being photographed together.
Sandra — who was wearing black jeans, a white T-shirt and a loose-fitting black sweater rounded off with zebra-print heels — slipped out the back door, while jeans and blazer-clad Keanu left via the main entrance before driving off in a Porsche car.
The pair have been friends since costarring in 1994 movie Speed. They last appeared on screen together in 2006 movie The Lake House.
Sandra was recently romantically linked to Ryan Reynolds — who she starred with in 2009 movie The Proposal — but she insisted he was “just a friend”.