She’s voiced a Smurf, she’s cameoed on How I Met Your Mother, she’s hosted SNL, and now Katy Perry has played a batty Raising Hope prison guard with a mustache! Last night Perry dropped in on the Fox family drama and acquitted herself nicely in limited screen time. Apparently Shannon Woodward, who plays Sabrina on Hope, is Perry’s best friend (Rihanna’s like WTF, Katy), so presumably the pop star wanted to hop on in order to give her pal’s show a boost. (The storyline is that Sabrina has belatedly joined up with the Occupy protests, and finds her way to the slammer in the process.) HitFix wonders if it matters: “Stunt-casting rarely moves the ratings needle in this day and age, and I don't know that Perry fans are going to want to tune in to see her so de-glammed, but at least it gives FOX something to promote.”