Rivalry Between Miley and Selena Heats Up with New YouTube Video

Imitation is the sincerest form of flattery? We think not, especially if you look at Miley Cyrus's latest YouTube video, in which the pop star and her BFF Mandy openly make fun of Selena Gomez and Demi Lovato. Catty!

Well, we know Miley has something to be jealous of these days. Not only is Selena being touted "the new Miley," but the adorable Texan has reportedly even snatched up Miley's ex-boyfriend, Nick Jonas.

Rumor has it that Selena has even been writing songs about Nick. A source claims that back in February, the star of Disney's Wizards of Waverly Place wrote a song inspired by the youngest Jonas Brother.

"They were writing lyrics for the bridge, and she was saying how Nick makes her so mad when he doesn't call her back," the source tells E! News about the song, titled "Head First." "The verse was definitely written about Nick Jonas."

The source reaffirms that Selena and Nick have been an item for several months.

Selena's rep, however, insists the two are nothing more than Disney co-workers and good friends. "She is friends with all of the Jonas Brothers," the rep said. "Her best friend, Demi Lovato, is on tour with them, so it makes sense that she's been at some of their shows."

For her part, Selena has been prepared to become the subject of tabloid gossip. "Sometimes you can get caught up in the media, but I've just learned to not let it bother me, and I know that it's only going to get worse," she told me. "I think that with the support of my friends and family, that's all I need to pull me through."

Friends and family are great, Selena, just make sure they're watching your back, especially in any dark alleys. We have a feeling Miley's gonna be lurking around waiting for you...