Ex Co-Star to Amanda Bynes -- GET A DAMN CHAUFFEUR!

Amanda Bynes is too rich to get DUIs ... because someone with her kinda paycheck can afford a chauffeur -- at least according to Amanda's former co-star from "What I Like About You."

Wesley Jonathan -- who played Amanda's BFF on the show -- was out in L.A. yesterday when we asked if he had anything to say to his old TV buddy, and he replied, "The only thing I would say to her is 'You got enough money. Get a chauffeur to take you everywhere.'"

And just like Jennie Garth -- who was also on the show -- Jonathan says he's tried to reach out Amanda to see how she's doing ... and all he's gotten was radio silence.