Lena Dunham is hosting Saturday Night Live  this weekend for the very first time alongside musical guest The National. Her new promos are in typical Girls  fashion, meaning there's partial nudity — but it's actually not from Dunham this time! Kate McKinnon stars with Dunham in the promos; apparently Dunham promised they'd wear the same thing, but only McKinnon shows up shirtless . At one point, Dunham says McKinnon looks like a "slut witch," but she's actually fully clothed at the time. Enjoy!