Kristen Stewart Heartbreak: FKA Twigs Warns 'Shut The F*ck Up' About Robert Pattinson 'Sex Life' Amid New Girlfriend Drama, No Wedding Invite

Now that Kristen Stewart's back in the limelight, FKA Twigs definitely doesn't want the "Twilight" beauty attending her wedding! In fact, the 27-year-old English songstress wants Stewart to keep quiet about her past relationship with Robert Pattinson - especially now that she's allegedly dating a girl!

Several months ago, the "Camp X-Ray" starlet described filming intense (and extremely awkward) sex scenes with her former beau during an exclusive interview with Harper's Bazaar UK:

"I only hate them when they're contrived. That's when it's grotesquely uncomfortable... On Twilight we had to do the most epic sex scene of all time. It had to be transcendent and otherworldly, inhuman, better sex than you can possibly ever imagine, and we were like, 'How do we live up to that?' It was agony. Which sucks, because I wanted it to be so good."

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Twigs was initially furious that Stewart revealed such intimate details regarding her past (onscreen) love life with R-Patz. An alleged OK! magazine later explained:

"She sent a message to Kristen to 'shut the f*ck up' about Robert because she lost the right to speak about him in public 'the moment she got into that car with Rupert Sanders'... It was pretty brutal."

The "Two Weeks" crooner is her fiance's "fiercest defender," and now "it will be a very long time before Kristen talks about Rob again in public."

Especially now that 25-year-old Stewart's experiencing crazy dating drama involving rumored girlfriend, Alicia Cargile. Just another reason for Twigs to withhold her wedding invitation!

Although they're no longer close, will the 28-year-old British heartthrob offer Stewart any advice and support (behind his future wife's back) - or is Robsten officially over for good?

RELATED: Kristen Stewart Ignores FKA Twigs Wedding Shade, Girlfriend Drama: Reunites With 'Twilight' Author Stephanie Meyer