JEALOUS K-STEW STAKES R-PATZ

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Sexy Vampire Boy ROBERT PATTINSON’s moaning to pals that "Twilight" co-star KRISTEN STEWART’s on-again-off-again feelings for him really bite – but a backstage explosion of jealousy over MEGAN FOX at the Teen Choice Awards totally SUCKED!

Although Pattinson and Fox have dated casually at least once or twice, the hunky star was absolutely floored when Kristen – suddenly in-his-face after he went onstage with foxy Fox to accept their "Choice Hotties" awards – bared her fangs and hissed: "You’re into Megan Fox!"

Said a Pattinson pal: "Rob couldn’t believe it at first. Kristen plays hard-to-get with him, then gets jealous over Megan? And she really ripped into him, saying, ‘I saw how you put your arm around her waist…I saw the way you touched her!‘ Rob thought it was ridiculous. He told her: ‘Oh, for Pete’s sake! She’s just a friend. We were onstage together…that’s it!’"

But Kristen refused to let up, hammering him relentlessly about Megan. Said the source: "Rob’s getting tired of the constant drama with Kristen. She keeps going back to her boyfriend, but then comes back to Robert – over and over again. She pushes him away, then has the nerve to complain about other women. It’s ludicrous. The girl needs to grow up!"

Stay tuned.