King Charles' Fiery Red Portrait Vandalized with 'Wallace and Gromit' Pic

King Charles' portrait got a bit of a facelift -- an animal rights group threw some artwork over it in a museum as an act of protest ... and now, Chuck looks a bit stop-motion-y. HRH's fiery painting -- which is currently on display in London at the Philip Mould Gallery -- was vandalized Tuesday by a couple of demonstrators who stormed in and did a quick hit job on the artwork ... and while it wasn't all that destructive, …