The Twi-Hards are in shock, possibly even more than R-Patz.
Love's young Hollywood dream, as manifest by the combined good looks and mystery of Robert Pattinson and his longtime soulmate Kristen Stewart is in tatters after Stewart was caught cheating on him with a married film director twice her age.
Kristen Stewart and Robert Pattinson, before it all went a bit pear-shaped
Stewart has made an out-of-character public apology, both cringeworthy and fascinating in its contrition, dismissal of "a momentary indiscretion" and begging to be forgiven by the man she has belatedly acknowledged - "Rob. I love him, I love him..."
Stewart may take some small comfort in the knowledge that she is by no means the first, and will probably not be the last, star to be swept away by the seductive environment of the film-set.
Elizabeth Taylor and Richard Burton shocked the world, and their spouses, with blatant displays of affection while filming Cleopatra in Rome. Even the Pope voiced his outrage at the pair's carrying-on
Hours of sitting around - often in locations far away from the rest of humanity - with only each other for distraction and amusement has led to innumerable romantic unions being forged as the camera winds, which can be no good for the poor cuckolds left back home.
Here are some of the more celebrated couplings which got steamy on film sets - including a few that were as shocking and dramatic as anything that later appeared on the big screen...