Demi Lovato, ‘On Air with Ryan’ Have Head-Banging Dance Party to ‘Cool for the Summer’
Demi Lovato Talks ‘Cool for the Summer,’ New Album: ‘This Is a Completely New Demi’
Adam Lambert Strips Down for ‘FAULT': ‘I Feel More Confident in My Talent’
Demi Lovato Releases Sexy New Single ‘Cool for the Summer': Listen
Channing Tatum Vogues, Does Funky Chicken in Classic Dance Moves Video
One Directions’s Niall Horan Takes the Best Celebrity Selfies
Katy Perry Starts Her Own Record Label: Who Did She Sign First?
Katy Perry, Kacey Musgraves Duet on ‘Teenage Dream,’ ‘Roar’
5 Things You Don’t Know About Tove Lo
Ellen DeGeneres ‘Sings’ Katy Perry’s ‘Birthday’
Katy Perry Graces 62 Covers of ‘Cosmo’ for First-Ever Global Issue
Check out Katy Perry as ‘Cupcake Queen’ for National Portrait Gallery
Katy Perry and Madonna Get Eyes Popping in Sexy ‘V’ Shoot
Iggy Azalea on How She Got Katy Perry to Give Her ‘Black Widow’
Katy Perry, Lorde, Robin Thicke, More Win at 2014 BBMAs
Did Lady Gaga Just Tweet Shade About Katy Perry?
Check out First Night of Katy Perry’s ‘Prismatic’ Tour: 15 Photos
Katy Perry Unveils ‘Prismatic Tour’ 25-Song Setlist
Did Rihanna Really Record With Katy Perry’s Ex?
Katy Perry Reveals Her Style Inspiration for ‘Prismatic’ Tour
Is Katy Perry Dating Diplo?
Katy Perry Throws World’s Worst Parties in ‘Birthday’ Video: Watch
Katy Perry Portrays Party Entertainers in ‘Birthday’ Video Preview
Katy Perry Plays ‘Who Knows Katy’ With Fan on ‘Kimmel’
Look-Alike Day: Which Two Celebs Resemble Each Other Best?
Candy, Cake, and Cookies Star in Katy Perry’s ‘Birthday’ Lyric Video
Vote: Which Hair Color Looks Best on Katy Perry?
Katy Perry Dyes Hair ‘Slime Green': Photo
Katy Perry Releases Cover Art for ‘Birthday’ Single