Katy Perry preps special costumes for Indonesian concert - Entertainment - The Jakarta Post
Ο χρήστης A.D. στο Twitter: "And somehow... @katyperry makes adjusting her in ear monitors look graceful at @KAABOODELMAR. https://t.co/VVkWnbilOE" / Twitter
Katy Perry Says She Treats Her Anxiety With Meditation, Not Prescription Drugs
Katy Perry Awkward Interviews
Katy Perry: "This Is How We Do" Video | Time
Adele's Grammy Cautionary Tale: How In-Ear Monitors Can Help (Or Hurt) An Artist | Billboard – Billboard
BBC Radio 1 - Jo Whiley, 17/09/2008, Katy Perry in the Live Lounge - 17 Sep 2008
Katy Perry Gets Stuck Mid-Air on Floating Prop During Nashville Show | Billboard – Billboard
Katy Perry Looks Back At Her Most Iconic Fits | Entertainment Weekly - YouTube