In her previous guest spot on Saturday Night Live and the “Last Friday” video, Katy Perry proved that getting a laugh is often as simple as putting on a pair of glasses, adopting a goofy voice, and then also being Katy Perry. Her guest-starring turn on How I Met Your Mother tinkered slightly with that formula, and now it will be once more put to the test, over and over again, when she hosts SNL on December 10. Perry made the announcement on Twitter (which was subsequently confirmed in a press release) in which she added that she would bring tour opener Robyn along as musical guest, thus freeing her up to concentrate on the comedy. Here’s hoping she doesn’t forget to be Katy Perry.