Emma Clark, Emotional 'Twilight' Fan, Cries 'How Could You Do This Kristen Stewart?' (VIDEO)

Sorry, Kristen Stewart, but "Twilight" fan Emma Clark is on Team RPatz.

The Twi-hard community was dealt a devastating blow on Wednesday when Stewart, who plays Bella Cullen née Swan in "The Twilight Saga," released a statement publicly acknowledging that she cheated on "Twilight" star Robert Pattinson with director Rupert Sanders. What looked like the perfect relationship -- the pair had been dating offscreen for many years; remember those happy faces! -- ended in a fit of tears ... Clark's tears.

Taking a page out of Chris Crocker's handbook, Clark -- otherwise known as the Nutty Madam in the "Twilight" community -- posted a video on YouTube with the following message: "HOW COULD YOU DO THIS KRISTEN?"

Despite Stewart's public apology -- "I love him, I love him. I'm so sorry." -- Clark is still visibly upset over the actress' poor decision.

"You were stupid enough to get photographed doing it! Don't be so stupid ... I can't believe she would do this. I thought they were photoshopped. I thought it wasn't real, but it's real!"

Unfortunately for the "Twilight" fan community, the indiscretion appears to be real. However, it looks like Sanders -- who directed Stewart in "Snow White and the Huntsman" -- is the one in front of the flame.

"CongratuF---INGGlations Rupert Sanders. You just pissed off a million people cause you just couldn't keep it in your pants," Clark tweeted, shortly after uploading her video online.

Still, how will Stewart's infidelity affect the fan reception of "Breaking Dawn, Part 2"? Hell hath no fury like a Twi-hard scorned ...

Watch Clark's video above.