PERRY SCORES: Thanks to host Katy Perry, who spent much of the night poking fun at fellow celebs like Christina Aguilera, Florence Welch and Pippa Middleton, as well as herself, Saturday Night Live, with musical guest Robyn, pulled a 2.7 Nielsen rating in the coveted adults 18 to 49 demo, its highest since the Nov. 5 episode, which featured It's Always Sunny in Philadelphia star Charlie Day as host and Maroon 5 as the musical guest. Below an embedded video of her turn as a "Hello Kitty"-obsessed Japanophile.