Xfinity’s Facebook Live With Katy Perry.

Katy Perry sat down with Xfinity for a Facebook Live session and talked about what her routine is before playing a show, her favorite costume from “Witness: The Tour,” one thing on her bucket list she’d most like to do, the funniest thing that’s happened on stage, how they decided what to show for Xfinity’s behind-the-scenes video shorts, how her and videographer Tim Sekiguchi teamed up, an upcoming tour DVD, sharing experiences on tour with fans in real time, supporting the Boys & Girls Club of America, her favorite snack to take on tour, her favorite part of visiting Boys & Girls Clubs of America around the US, her favorite thing about being on tour, what made her want to become a singer, why she chose the Boys & Girls Club as the charity for “Witness: The Tour,” what she does to take care of her voice, when she’ll get her “Witness: The Tour” tattoo, has she eaten anything new on tour, and more.