Here is Katy Perry kissing Miley Cyrus on the mouth at Miley's show at the Staples Center in L.A. last night. Today, basically everybody in America went about their Sundays with no knowledge that two female pop stars kissed each other in public. This used to be a big deal!

While performing her hit song "Roar" at the NRJ Music Awards in Cannes on Saturday, Katy Perry suffered a devastating lip-sync malfunction.

Awww. Pop's hottest, most convincingly eternal couple, John Mayer and Katy Perry, stopped by Good Morning America to premiere their "Who You Love" video and, in the process, awkwardly suffered through their first-ever shared interview. They discussed their seating configuration woes ("We don't quite know what kind of body language we're supposed to be exhibiting at the moment—you get too close and it's too touchy-feely, you sit too far away they say, 'I don't see chemistry,'" lamented Mayer) and first date (they had dinner, reported Perry, adding fascinatingly, "We share music as a love together, you know, that's like a common interest so..."). And then Mayer talked about his adverse reaction to watching Perry in the studio:

Katy Perry opened Sunday's American Music Awards in geisha drag. Or maybe it was Madonna circa '99 drag. Either way, and as usual, her look and performance were tedious and bereft of personality. Perhaps Perry realized the best she could do was make Twitter users cluck their tongues, and inspire think pieces in which the word "problematic" would feature prominently.

For whatever reason, this video of an apparently sloshed Robert Pattinson and Katy Perry performing Boyz II Men karaoke staple "I'll Make Love to You" at a friend's birthday in December 2008 surfaced on the Internet today, nearly five years later. The performance is pretty atrocious (also entertaining in the way closed circuit video of drunk celebrities crawling into one another's laps can't help but be), but, then, neither of them is known for being a particularly good singer.

Katy Perry is one of the most bankable contemporary pop singers—"Roar," the first single from her new album Prism, became her eighth No. 1 on the Billboard Hot 100 in August. Prism is expected to sell about 300,000 copies its first week in stores. It is a dreadful album, way too concerned with preserving Perry's star than using said star to push sonically. It is also dreadful because Perry has absolutely nothing to say.

"I love Madonna to death, but she's never going to give me that damn baton. I'll probably turn into more of a Joni Mitchell," says Katy Perry, who apparently has never listened to Joni Mitchell or tried to pry anything from her cold, dead painter hands.

Saturday Night Live has announced its guest-hosting schedule for the 39th season: Tina Fey with Arcade Fire; Bruce Willis with Katy Perry; and a delicate little flower whose name rhymes with Highly Virus.

Last week, Katy Perry and Lady Gaga released the first singles of their respective upcoming albums, Prism and (my fingers groan a little bit louder with old age every time I type this) ARTPOP. The ensuing battle to the top of the charts was like a taste test between a Saltine and a Saltine piled with sprinkles, truffle oil, caviar, gold flakes, Madonna's post-True Blue eyebrow pluckings, and lead paint chips from the walls of Andy Warhol's Factory. Both songs are meta-noise — Perry's reggae-lite "Roar" is about working up the nerve to cause a ruckus ("I am a champion and you’re gonna hear me ROAR"), while Gaga's aggressively ugly "Applause" is about having the nerve to declare how life-affirming ruckus directed at you can be ("I live for the applause, applause, applause"). If you play "Roar" and "Applause" simultaneously on stereos facing each other, the songs solve each other while opening up a black hole of infinite vacuousness.

People are so mad at Robert Pattinson and Katy Perry.

Seven months after they first broke up, America's best-matched couple, John Mayer and Katy Perry, have again called it quits. According to US Weekly, the two, who have dated since last summer, split because of issues over their schedules. But don't worry! There's hope they might get back together, according to the magazine's surely reliable sources.

Last week, CBS emailed all the stars attending the Grammys and asked them to cover their breasts with fabric before they arrived.

J.Lo joked about CBS's now-infamous wardrobe memo, but Katy Perry openly defied it — and some took notice.

Actor Johnny Lewis, best known for his stint as Chili on The O.C. and, more recently, for playing Kip "Half-Sack" Epps on FX's Sons of Anarchy, was found dead yesterday near the body of a murdered 81-year-old woman believed to be his landlady.

American Idol couldn't lure Katy Perry with $20 million, and now Mariah Carey knows she's worth less than Katy.

World-renowned acne medication spokesperson Katy Perry went to a water park yesterday and (NSFW) flopped her bare ass around for the whole world to see.

Hollywood Communists John Mayer and Katy Perry were photographed out on the town Wednesday evening, when they should have been in their separate homes rooting for Team USA to win gold in NBC's pre-taped Olympic broadcast.

We knew The Amazing Spider-Man would be big when it broke its first record earlier this week. Now after six days, it's at the top of the box office with $140 million.

The 90-minute, needlessly 3D documentary Katy Perry: Part of Me is a fantastic document of how guarded our superstars come in 2012. There's more revealed about Madonna in a single snort or eye roll in 1991's Truth or Dare than there is Katy Perry in the entirety of Part of Me. We learn that being a famous singer is Perry's childhood dream come true, that her goal is to make people smile, that she's not yet ready for kids. The biggest revelation is that she looks fantastic out of makeup, and if the words in her Proactive commercial are true, even that shouldn't come as a surprise. No warts at all.

The village boys of Los Colorados are back, and they're as shirtless as ever.