Katy Perry was ready to rumble when she released her new single, "

"I started the record in November, but things were really flowing by the spring and it's a song about standing up for yourself," Perry told MTV News. "Who can be the biggest bully in the equation is yourself and can get in your way and it's a song about speaking up for yourself and having the strength."

Perry showed off that strength as she had the "last word," closing out the 2013 Video Music Awards with a knock-out performance of .

On Monday (August 26) Perry revealed a short teaser for the video, which is the lead single off her upcoming album Prism. The clip features the singer channeling Jane of the Jungle as she's seen swinging through trees and vines, while wearing a leopard bikini top and grass skirt.

Perry, who revealed she wrote the song back in March, is following up her hugely successful album, Teenage Dream, which gave Perry five number one singles. Yet, it seems as if Perry is picking up right where she left off with of her career.

"You can never be too sure because it doesn't always work out like that," Perry said when asked if she thought "Roar" would be just as successful as her previous efforts. "But for me I've always kind of gone with my intuitive feeling — if something really moves me, if I get those goosebumps or chicken pox, if I get those then I know it struck a chord in me."

Ask actress Hailee Steinfeld what she's been reading lately, and she may struggle to name a novel that isn't becoming a big-screen adaptation in which she'll star. It seems the 16-year-old star of films like "True Grit" and "Ender's Game" is quickly becoming the go-to adaptation girl, and she's totally okay with that. To wit: next she'll star in the latest re-telling of Shakespeare's famous tale of star-crossed loves,

"I was reading the book in school at the time that I heard that they were remaking the film, and you know, I had watched the [director Franco] Zeffirelli version a few years ago ... The idea of knowing that it had been done before was present but just sort of walking into it with a different director who had a different take with all these incredible actors — everything about it was so different although we're retelling the same story," Steinfeld said of why she signed on to the project. "But I think what's so incredible about it, and what I love so much, is that so many themes in the movie are so relevant today, and no matter how it's told or who tells the story, it's still relevant. It's so relatable."

Though Steinfeld referenced the 1968 version during our Fall Movie Preview week interview, she's no stranger to the splashy Baz Luhrmann version from 1996, which it's worth noting, opened the same year she was born.

"I love that film. I love how different it is," Steinfeld said. "Again, it's the same story but told completely different. I ...

BROOKLYN, New York — Watching Macklemore & Ryan Lewis perform at the 2013 MTV Video Music Awards was moving, but for singer Mary Lambert, who was actually performing the track, it was a bundle of emotions.

"It was really exhilarating. It was like all of these rush of things, but then right before, I was super calm, like, 'We got this,' " she told MTV News not long after accepting the Best Video With a Social Message alongside her Seattle collaborators.

During the trio's VMA performance on Sunday night, Macklemore delivered the song's poignant rhymes with a heartfelt delivery, while Lambert sang the hook. Jennifer Hudson kicked the set up a notch with her surprise cameo toward the end of the song. To close, J-Hud and Lambert faced each other and had a good old-fashioned sing-off before sharing a hug. It was just one of many VMA moments for Lambert.

"That was so cool," the singer told us. "In rehearsals, I was like, 'How can I not talk about this [cameo]? I have to keep my mouth shut.' It was really hard," Lambert admitted. "[Hudson's] a phenomenal singer and a phenomenal person, performer — all of it."

Macklemore, Ryan and Mary shared in a few more special surprises backstage at the Barclays when they all bumped into Kanye West. Mack gave the G.O.O.D. Music MC a pound and a hug before showering him with praise. "Thank you for raising the bar as an artist for us. I appreciate it," the Seattle MC said, before also congratulating 'Ye on his ...

As it is, Justin Timberlake will give fans as much music this year as he's released in his entire solo career. He's dropped the year's best-selling album to date, The 20/20 Experience, and is prepping its sequel, The 20/20 Experience — 2 of 2
 for September 30.

But in an interview with MTV News' Sway Calloway at Sunday night's 2013 MTV Video Music Awards, just before he broke the Internet
 by reuniting
 with 'NSYNC, Timberlake revealed that he originally planned to serve up four times that much product.

"Here's the thing that you have to understand about all of it, is it was all written at the same time," Timberlake said of the two albums he recorded last year. "How it's being released ... we kinda thought this was a cool way to do it. I went through a bunch of different ideas on how to release it. One being four EP's of five songs."

Plans obviously changed, but JT said the process of building enough songs for those releases came during one of the most fruitful creative periods of his career. "We sat down together, [Timbaland], myself, and crew ... a bunch of other producers," he said. "I just kind of assembled this great group of people and ... we put together more than 20 songs. We had 25 to 30 songs in 20 days. So we were just sprinting and sprinting and sprinting and then trying to figure out a way to put it out."

They finally agreed to do a double album, staggering the releases ...

Parents would do anything to get their kidnapped child back, and director Denis Villeneuve's "Prisoners" shows that "anything" could even encompass giving up one's soul. In the film, Jake Gyllenhaal plays a detective who finds himself at odds with Hugh Jackman, a father named Keller Dover whose daughter and her best friend were ripped out of their families' lives on Thanksgiving. But the horrific crime isn't without a suspect, a creepy looking mystery man played by "There Will Be Blood's" Paul Dano.

Dano and Gyllenhaal come face to face in this rain-soaked exclusive clip, as "Prisoners" takes part in MTV News' Fall Movie Preview. The film opens on September 20, but you can get your first piece of the drama right now.

Dano's no stranger to playing intense characters, and his startled Alex Jones makes an impression in this clip despite leaving all the talking to Gyllenhaal's determined Detective Loki. But there's more to Jones than meets the eye, and when the kidnapping charges don't stick, Keller Dover takes matters — and Jones' life — into his own hands.

Maria Bello co-stars as Jackman's wife, with Terence Howard and Viola Davis rounding out the cast as the parents of fellow kidnapping victim. The film comes from Canadian film director Denis Villeneuve, who will debut "Prisoners" at the 2013 Toronto Film Festival in early September prior to its wide release.

"Prisoners" opens in theaters everywhere later this year.

From "Romeo and Juliet" to "Ender's Game," "Riddick" to "Oldboy," the MTV Movies team is delving into the hottest upcoming flicks in our 2013 Fall Movie Preview. Check ...