Kristen Stewart will host 'Saturday Night Live' for the first time this weekend, taking the actress out of her comfort zone. The 26-year-old star talked about her fear of hosting in an interview Thursday on 'The Tonight Show Starring Jimmy Fallon.' She told him, "For six years, I've just been being a total wuss about it and then I finally was like, at some point, you just have to bite the bullet, you know? And just fail. It will make you stronger, man.