Liam Hemsworth -- Check it Out ... I Have Sole!!! (PHOTO)

Liam Hemsworth was chillin' a little too much Saturday ... cruisin' barefoot in a Malibu supermarket.

Miley Cyrus' ex hit up Ralphs on a hot, sunny day, but still ...

Check out the ball of his foot ... not the kind of thing you want to see in the produce department.