Perez Hilton — Madonna agrees — Katy Perry is one Unapologetic Bitch! The Dark Horse songstress crashed the music legend's concert on Tuesday night, during the Inglewood, California leg of her Rebel Heart tour. And things got a little crazy! Photos: Katy Celebrat... more info

TMZ — Madonna rocked The Forum in L.A. Tuesday night, and there was a revelation during the concert ... Katy Perry has mother issues. Katy joined Madonna, as a bunch of stars cheered them on, including AJ McLean, Rondell Sheridan, Joe Walsh, Sean Hayes,…... more info

Perez Hilton — Stars really ARE just like us! You'd think someone like Katy Perry would go to the ritziest restaurant she can find for a star-studded celebration, but the pop princess decided to ring in her 31st year a little differently! The singer became another ... more info

Perez Hilton — Yikes. In Russell Brand's revealing new documentary, the comedian takes several jabs at his ex wife Katy Perry and their 14-month marriage. As we saw in her flick Katy Perry: Part Of Me, the relationship didn't end on the best note: a text from Brand... more info

Time — She is a big supporter of the Clinton's 2016 campaign more info

Perez Hilton — She's sure got the spirit! Katy Perry is apparently feeling a bit political as she traveled to Des Moines, Iowa over the weekend to lend her support to Democratic hopeful Hillary Clinton! The Firework singer had a bit of fun with it too as she took o... more info

Perez Hilton — This is so sad. After celebrity makeup artist Jake Bailey apparently committed suicide on Friday, stars reacted across Hollywood with grief and sadness over his death. Now, Katy Perry — one of the stars he worked most closely with — has responded... more info

Time — Sam Smith, Katy Perry, John Stamos, and more are losing their minds more info

Perez Hilton — Our hearts are breaking. On Friday, Jake Bailey was found dead at his home after allegedly committing suicide. The 37-year-old apparently died of carbon monoxide poising at his LA residence. The celebrity makeup artist had worked closely with stars l... more info

Perez Hilton — Katy Perry is one of the latest stars to join the ranks of Kim Kardashian West and other celebs whose famous faces have been digitized in mobile game form! The pop princess gave us a sneak peek at her app earlier this month, and it looks APP-solutely... more info