While the Katy Cats were out celebrating the release of Katy Perry's new single, and her upcoming performance at the 2013 MTV Video Music Awards on August 25, her duet with her on-again, off-again boyfriend John Mayer hit the 'net.

On the folky tune, from Mayer's upcoming August 20 album, Paradise Valley, the two singers trade lines about falling for one another. At the end of the track, Perry even lets out a little "love giggle." Fan Juliette told MTV News, "They're perfect together. I think that it's going to be a really big success."

Carlos added, "They're both good artists, and I think it's always a good idea to link [up on] a duet."

Katy's fans told MTV News they are excited to see Perry flexing her vocal cords on a genre of music she doesn't tend to explore very often. "Obviously, their music is very, very different, but I like a lot of Katy Perry's acoustic stuff, like 'Mannequin' from One of the Boys," Gabe said. "I'm really excited to see her bring those roots back. I'm all for love, and ... if they're happy, they're happy, and people should just let them be."

In addition to appearing on Mayer's album, Perry confirmed that the musician also played guitar on her October 22 album, Prism. Now, fans have two albums on which to listen to the singers make sweet music together. "I love it. I love John Mayer, love his music," Morgan said. "I was hoping they would collaborate on something anyway, so I love ...

Another day, another pair of big names to add to the ever-growing list of performers for the 2013 MTV Video Music Awards.

Miley Cyrus and Robin Thicke have just announced they'll take the stage at the show, joining previously announced performers Katy Perry, Lady Gaga and Kanye West on August 25 at the Barclays Center in Brooklyn!

One Direction, who made quite the impact at last year's show — performing their single and snagging three Moonmen, including Best New Artist and Best Pop Video for "What Makes You Beautiful" — have also been confirmed to make an appearance at the 2013 VMAs.

Miley, Robin and 1D will also go head-to-head in a brand-new VMA category: Best Song of the Summer, which pits six of the season's hottest tracks against each other in a battle for summer supremacy. Miley's "We Can't Stop," Thicke's inescapable "Blurred Lines" and One Direction's "Best Song Ever" go head-to-head with Daft Punk's "Get Lucky," Calvin Harris and Ellie Goulding's "I Need Your Love," Selena Gomez's "Come & Get It," for the inaugural award, powered by Windows Phone.

We've been debating who had the hottest song of the summer for months, but now, you're going to have the final say ... and the winner is going to walk away with a KAWS-designed Moonman!

Voting Is Now Open!

Best Song of the Summer is a socially-driven category, and beginning today, fans can vote for their favorites via Twitter, Instagram or Vine by using the appropriate hashtag: #votemiley, #votedaftpunk, #voteselena, #voteonedirection, ...

Lady Gaga is keeping her lips sealed when it comes to her highly anticipated return to the VMA stage later this month.

The VMA performer stopped by Ryan Seacrest's radio show, in an interview that aired Tuesday (August 13), and talked a bit about her August 25 performance.

"Would you like to see some diagrams?" she joked when asked about what fans should expect from her VMA performance. But, she did confirm she wouldn't be wearing any meat to this year's show, where she is slated to perform "Applause." "We're narrowing it down. I've cut out the poultry and I've cut out the vegetables, " She said of her outfit. "We're going more with textiles."

With Gaga back on the scene after undergoing hip surgery earlier this year, she opened up about why she decided to name her song "Applause." "It's a little deeper. When I was finishing the [Born This Way] tour, I was physically breaking," she said. "I was in a lot of pain, but didn't know where really. I have a strong threshold for pain, so I kept slapping myself saying, 'Get it together.' The only thing that kept me going was the applause. And I was able to drown out the pain and finish the show."

With less than two weeks until she hits the VMA stage, Gaga admitted that she was ready to drop her new single, on Monday, despite having originally intended to drop her lead ARTPOP single on August 19.

"I've actually had this song for a year and it's been killing me," ...

Hip-hop music was built off of competition and Kendrick Lamar gave fans and artists alike a reminder of what it is like to take rap's battlefield.

On Monday night, Big Sean dropped a leftover track originally recorded for his upcoming Hall of Fame, and it featured Jay Electronica and a fiery verse from K-Dot. After proclaiming himself the king of New York (and the west coast) Kendrick name-dropped a gang of his rap friends, but he wasn't so nice about it.

"I'm usually homeboys with the same n----s i'm rhymin with/ But this is hip-hop and them n----s should know what time it is/ And that goes for Jermaine Cole, Big K.R.I.T., Wale/ Pusha T, Meek Mill, A$AP Rocky, Drake/ Big Sean, Jay Electron', Tyler, Mac Miller/ I got love for you all but I'm tryna murder you n----s/ Tryna make sure your core fans never heard of you n----s/ They don't wanna hear not one more noun or verb from you n---as," the Black Hippy MC rapped with an extra grit to his already gravelly voice.

"I hear u loud and clear my n---a... @kendricklamar," Pusha T tweeted right after the song was released.

Rap artists from all over have since been flooding Twitter weighing in with their own reactions since the track debuted on New York DJ Funk Master Flex's Hot 97 radio show. "I never really tweet about music. But good lord.. @kendricklamar just like.. Bodied everyones entire year's worth of raps lol," Just Blaze wrote in awe.

Veteran hip-hop producer Pete Rock

Hip-hop music was built off of competition and Kendrick Lamar gave fans and artists alike a reminder of what it is like to take rap's battlefield.

On Monday night, Big Sean dropped a leftover track originally recorded for his upcoming Hall of Fame, and it featured Jay Electronica and a fiery verse from K-Dot. After proclaiming himself the king of New York (and the west coast) Kendrick name-dropped a gang of his rap friends, but he wasn't so nice about it.

"I'm usually homeboys with the same n----s i'm rhymin with/ But this is hip-hop and them n----s should know what time it is/ And that goes for Jermaine Cole, Big K.R.I.T., Wale/ Pusha T, Meek Mill, A$AP Rocky, Drake/ Big Sean, Jay Electron', Tyler, Mac Miller/ I got love for you all but I'm tryna murder you n----s/ Tryna make sure your core fans never heard of you n----s/ They don't wanna hear not one more noun or verb from you n---as," the Black Hippy MC rapped with an extra grit to his already gravelly voice.

"I hear u loud and clear my n---a... @kendricklamar," Pusha T tweeted right after the song was released.

Rap artists from all over have since been flooding Twitter weighing in with their own reactions since the track debuted on New York DJ Funk Master Flex's Hot 97 radio show. "I never really tweet about music. But good lord.. @kendricklamar just like.. Bodied everyones entire year's worth of raps lol," Just Blaze wrote in awe.

Veteran hip-hop producer Pete Rock

There's been a lot of talk about how Lorde, a 16-year-old singer from New Zealand, has the capacity to save music with her expertly spun, wiser-than-her-years, totally offbeat pop tracks. Well, more fuel has just been added to that fire, as her upcoming debut LP, which drops September 30, finally has a name: Pure Heroine.

Lorde Instagrammed the title and cover art Monday (August 12), followed up by a tweet reading: "her-o-ine n. 1. a woman noted for courage and daring action. 2. a woman noted for special achievement in a particular field." It's a fitting definition for the young singer, considering Lorde is the first woman in 17 years to top the alternative chart with her single "Royals."

Despite her early success, Lorde admits that she doesn't wholly stand by every track that she's ever written — even songs like "Million Dollar Bills," off of her recent Love Club EP. "I'm the kind of artist that writes something and thinks it's cool for like 48 hours and then hates it," she told MTV News.

Reflecting on the track listing for Pure Heroine, however, Lorde touches upon one track, "Ribs," that she still digs — despite her critical and evolving ear.

"A big stress for me is getting old," she said, majorly bumming out anyone and everyone not in the tween demographic. "I'm in an industry where so much importance is placed on the fact that I'm 16.... So that song is kind of about that."

Check out the full Pure Heroine track list below:

» "Tennis Court"
» ...

There's been a lot of talk about how Lorde, a 16-year-old singer from New Zealand, has the capacity to save music with her expertly spun, wiser-than-her-years, totally offbeat pop tracks. Well, more fuel has just been added to that fire, as her upcoming debut LP, which drops September 30, finally has a name: Pure Heroine.

Lorde Instagrammed the title and cover art Monday (August 12), followed up by a tweet reading: "her-o-ine n. 1. a woman noted for courage and daring action. 2. a woman noted for special achievement in a particular field." It's a fitting definition for the young singer, considering Lorde is the first woman in 17 years to top the alternative chart with her single "Royals."

Despite her early success, Lorde admits that she doesn't wholly stand by every track that she's ever written — even songs like "Million Dollar Bills," off of her recent Love Club EP. "I'm the kind of artist that writes something and thinks it's cool for like 48 hours and then hates it," she told MTV News.

Reflecting on the track listing for Pure Heroine, however, Lorde touches upon one track, "Ribs," that she still digs — despite her critical and evolving ear.

"A big stress for me is getting old," she said, majorly bumming out anyone and everyone not in the tween demographic. "I'm in an industry where so much importance is placed on the fact that I'm 16.... So that song is kind of about that."

Check out the full Pure Heroine track list below:

» "Tennis Court"
» ...

When it rains, it pours. And on Monday, the Katy Cats were not only gifted with the official release of Katy Perry's new single, but also her duet with John Mayer, "Who You Love."

And the Paradise Valley cut is true to Mayer's musical form. It's folky and acoustic as the two real-life lovers trade lines about the one they love. "My girl, she ain't the one that I saw coming / Sometimes I don't know which way to go / And I tried to run before but I'm not running anymore," he sings.

Perry answers, "My boy he ain't the one that I saw coming / And some have said his heart's too hard to hold / And it takes a little time / But you should see him when he shines."

The two singers have been dating on and off since last summer. While Mayer confirmed their breakup back in April, Perry told Vogue in June that she still had feelings for her ex. Then in July, Mayer hinted at a reunion during a concert.

Perry opened up about the song to SiriusXM Hits 1, explaining the origin of her giggle at the end of the track. "I think that's just a love giggle," Perry explained. "It's like the ones that Mariah Carey had in 1990 and stuff like that . . . Yeah I think I was going for that, I think I was just so happy, I love that song."

Mayer's Paradise Valley drops August 20, while Perry will drop Prism on October ...