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Hands off my Bieber!

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Don’t mess with a pack of wild Beliebers.

Disney star Selena Gomez, 18, and singing supernova Justin Bieber, 17, decided to go public with their relationship after months of denying the rumors they were more than good friends. But canoodling with the world’s reigning teen idol is becoming an increasingly dangerous affair.

Steamy pictures of the baby-faced stars kissing passionately on a beach in Maui last week had legions of jealous 14-year-old girls taking to Twitter and Facebook to announce they’re out for blood.

PHOTOS: JUSTIN BIEBER

“Stay away from Justin pedophile,” one angry fan tweeted at Gomez. “I’m gonna kill ya in the night underneath your smelly bed.”

Others opted for friendly advice over death threats.

“Dear Selena Gomez. I hate you more than life. Go jump off a cliff. K? Bye,” tweeted a Bieber fanatic.

Another ominous Biebhead warned: “Selena Gomez is dangerously close to a long, slow painful death.”

The puppy-love relationship has spawned Facebook groups such as “I hate Selena Gomez cuz she is dating my man.”

Gomez, who got her break on the Disney show “The Wizards of Waverly Place” and has released three pop albums, previously dated teen heartthrob Nick Jonas of the Jonas Brothers. But even dating an eligible member of one of the world’s biggest boy bands couldn’t prepare her for the wrath of Bieber Nation.

A selfless fan concerned only with Bieber’s happiness warned Gomez that millions of women out there have his back: “If Selena Gomez breaks Justin Bieber’s heart, I will not break her face! I will kill her without kindness.”

Being the girlfriend of a singing phenomenon who makes girls faint and cry hysterically has never been a comfortable post to fill.

When Priscilla Presley met Elvis in 1959 at the ripe old age of 14, she was hidden from the masses.

“There was no interest in promoting anything to do with his private life,” said one Elvis historian. “For a long time, nobody knew about her. She was a secret. Every manager since time began has said, ‘Don’t let them know you have a girlfriend or a wife.’ ”

When she was finally discovered, Priscilla was referred to disparagingly as Elvis’ “live-in Lolita” until he made an honest woman of her in 1967.

In the current world of total exposure, however, it’s virtually impossible to keep a celebrity relationship under wraps.

An older, wiser, more cynical Priscilla Presley discussed the pitfalls of her relationship with the King after her divorce.

“I realized I couldn’t give him the kind of adulation he got from his fans,” she said. “He needed that adulation desperately. Without it, he was nothing.”

akarni@nypost.com