In the September issue of Seventeen magazine, Miley Cyrus is finally opening up about her breakup with Jo Bro Nick Jonas. "At first I bawled for a month straight," she tells the mag. "I was so sad. I just went into this weird funk. And I dyed my hair black."

Miley says she was "rebelling against everything Nick wanted me to be," adding, "Nick wanted me to get highlights -- and so I did that, and I got myself looking great. And then, on the day we broke up, I was like, 'I want to make my hair black now – I don't want to look pretty; I want to look hard-core.'"

Miley Cyrus may be a mean girl after all. In yet another one of the 'Hannah Montana' star's YouTube skits with her BFF Mandy Jiroux, the teens mock Selena Gomez and Demi Lovato for their T-shirts, makeup and more. Miley and Mandy's parody is spliced with Selena and Demi's original video, flipping back and forth between the two. The video comes after rumors that Selena is dating Miley's ex, Nick Jonas. Could this be retaliation?

With all that energy onstage, it's no wonder that the Jonas Brothers get a little extra pick-me-up from caffeine. In fact, the youngest of the trio drinks around four caffeinated beverages a day!

"I have an energy drink when I wake up and a coffee when I eat breakfast," Nick Jonas, 15, tells Teen magazine. "Then [I have] a coffee at dinner and an energy drink right before I go onstage. Then I'm good."

Read the full interview in the latest issue of Teen (featuring the Jo Bros on the cover), which is on sale now!

If you've been keeping up with the Kardashians, second oldest sis Kim Kardashian recently admitted to People that she's crushing on one of the Jonas Brothers. Backstage at KIIS-FM's Wango Tango concert on Saturday, Kim said, "We met the Jonas Brothers -- Nick is so cute."

And what does her football-player boyfriend think? "I don't think Reggie [Bush] will get mad, because [Nick] is, like, 15," she said. "I really shouldn't say that he's cute. It's a little inappropriate! They're adorable."