By Kate Thomas for MailOnline. She has invited her fans into her home for a week as she sleeps, cooks and hangs out with friends, as part of a new experiment to promote her album Witness. And Katy Perry 's latest antics involved her working up a sweat with personal trainer to the stars, Tracy Anderson, from inside the Witness Worldwide house. The pop princess, 32, joined by sisters, Erin Foster and Sara Foster, best known for playing Naomi Clark's sister Jen in , to join her for her workout.
Tina Fey strips down in 'Saturday Night Live' promo - watch
Katy Pierce (klp) on Pinterest
Katy Perry and John Mayer visit Vegas strip club
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Tina Fey has previewed the season premiere of Saturday Night Live. The former 30 Rock star appeared in a series of mini-sketches with Kenan Thompson, where she even stripped down in a humorous bid to entice viewers. Fey also teased that fans of Breaking Bad should tune in for some possible surprises on Saturday's episode. The actress will be hosting SNL for the fourth time, while musical guests Arcade Fire will be making their third appearance. Cecily Strong will be making her debut as Seth Meyers's new 'Weekend Update' co-host , while six new cast members are to be introduced as well.