Robert Pattinson & Sienna Miller Cheating Shock, Movie 'Chemistry' Ends FKA Twigs Engagement?

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Robert Pattinson stars alongside Sienna Miller in the upcoming action flick, "The Lost City of Z." Rumors initially suggested that the 29-year-old British heartthrob indulged in a romantic fling with the stunning blonde actress not too long ago. Will their onscreen reunion reignite such intense sexual chemistry, despite Pattinson's upcoming wedding to beloved English songstress, FKA Twigs?

UPDATE: Robert Pattinson Betrayal HOAX: FKA Twigs Ignores Sienna Miller Flirting, 'Power & Beauty'

Robert Pattinson Movie Trouble: 'The Lost City of Z' Violence Upsets Locals, Scares Animals

Another seedy report from Star magazine implies that Pattinson and Miller can't ignore their strong emotional attachment:

"They're spending a lot of time hanging out in each other's trailers and often meet up for late-night pub runs," an alleged insider explains. "The cast and crew are picking up on the mutual attraction."

Twigs appears extremely happy with her "Twilight" beau, but supposedly the relationship's getting rather strained and things are already falling apart. Which is exactly why Pattinson goes to Miller for comfort anf support...

"They fight. Rob threatens to break up with her and Twigs dares him to," another snitch reveals. "With Sienna in the picture, no one would be surprised if he made good on his threat."

Kristen Stewart broke R-Patz's heart after cheating on him with movie director Rupert Sanders several years ago - would the "Life" star purposefully put his fiancee through the same pain and sorrow?

Probably not. According to GossipCop.com, a legit source close to Pattinson insists that the entire story is "completely fabricated." The award-winning actor does NOT plan on dumping his "Two Weeks" muse, and their engagment's still on. But would MstarsNews readers still prefer him to pursue a secret affair with the 33-year-old "American Sniper" beauty?

Meanwhile, "The Lost City of Z" hits theaters sometime in 2016. Twigs' "dream" wedding day still remains unconfirmed.

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