BITE THIS, VAMPIRE LOVERS! A secret Hollywood plot’s afoot to forge a brand-new “Twilight” movie sequel starring music’s most magical starburst, sizzling singer TAYLOR SWIFT – who’s sold more albums than ANY artist in 2009 – and her real-life loverboy hunk TAYLOR LAUTNER, who already plays a werewolf on the mega-successful vampire saga.

Here’s the kicker: Sexy Swift, 19, will play a character called “Nessie” – the half-human/half-vampire spawn of ROBERT PATTINSON and KRISTEN STEWART! (Picture THAT, Fang Fans!)

WARNING: Before you start phoning Fandango for tickets, be aware that hush-hush wheelingdealing’s still ongoing – mainly because author STEPHENIE MEYER’s playing hardball with her book publishers, saying she might NEVER write another “Twilight” megahit (gasp!).

But, hey, these Hollywood slicky-boy moguls never take “no” for an answer, folks. They’re telling Stephenie: “Book, schmook! We’ll pay you gazillion$$ just to write us a brief plot outline! Or, write the whole damn screenplay, babe! Whatever...We love ya!”

Producers are “absolutely convinced Taylor will kill in the role,” said a source. “She has unbelievable presence, and they think she and Taylor Lautner project great chemistry together.”

(Do NOT ask me how baby “Nessie” grows up so fast. What is this…Vampire 101?!)

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