Sexy Kat Dennings stars as streetwise and sassy Max Black on CBS hit sitcom 2 Broke Girls.. “ There's only one tool that can change my ’tude, and I’m going to need two double-A batteries and a 20-minute break .”. Yes, that’s how Kat Dennings talks on the CBS sitcom “2 Broke Girls,” particularly when she slips into the mustard-and-red uniform of Max Black the waitress. And yes, some folks don’t like it.