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...
Angelina Jolie and Brad Pitt
In 2004, rumors surfaced that co-stars Brad Pitt and Angelina Jolie were doing more than just acting on the set of the action flick "Mr. & Mrs. Smith." Pitt, who was married to Jennifer Aniston at the time, would go on to <a href="http://www.justjared.com/2009/01/07/brad-pitt-denies-angelina-jolie-affair/" target="_hplink">deny the affair allegations</a>, as did <a href="http://www.people.com/people/article/0,,20004139,00.html" target="_hplink">Jolie</a>, but tabloid reports continued nonetheless. In March 2005, <a href="http://www.people.com/people/article/0,,1042412,00.html" target="_hplink">Aniston filed for divorce</a> from Pitt. Still, Jolie raised eyebrows again in October 2008, when she told the <em>New York TImes </em>that she <a href="http://today.msnbc.msn.com/id/27242037/ns/today-entertainment/t/brangelina-affair-started-mr-mrs-smith/#.UBA4dzHLyRk" target="_hplink">looks forward to the day her six children with Pitt can watch "Mr. & Mrs. Smith."</a> "Not a lot of people get to see a movie where their parents fell in love," Jolie said.
Elizabeth Taylor and Richard Burton
Before there was Brangelina, there was Elizabeth Taylor and Richard Burton. Screen siren Taylor famously took up with British thespian Burton while filming 1963's "Cleopatra." The only problem? Both were married at the time -- Taylor to fourth husband Eddie Fisher and Burton to Sybil Williams, <a href="http://news.google.com/newspapers?nid=1957&dat=19920621&id=4GZGAAAAIBAJ&sjid=3OgMAAAAIBAJ&pg=4546,5429384" target="_hplink">his wife of fourteen years</a>. On March 15, 1964, just <a href="http://news.google.com/newspapers?id=wwIqAAAAIBAJ&sjid=ZicEAAAAIBAJ&pg=7447,4620597&dq=elizabeth+taylor+marries+richard+burton&hl=en" target="_hplink">nine days after her divorce from Fisher was finalized</a>, Taylor made Burton her fifth husband. The couple divorced in 1974, <a href="http://www.huffingtonpost.com/2011/03/23/elizabeth-taylor-divorce_n_839611.html" target="_hplink">remarried in 1975</a> and finally divorced for good the following year.
Ingrid Bergman and Roberto Rossellini
Academy Award-winning actress Ingrid Bergman was married to Petter Lindström, with whom she had a daughter, when she landed a role in Italian director <a href="http://www.tcm.com/this-month/article/60080%7C0/Stromboli.html" target="_hplink">Roberto Rossellini's film "Stromboli" in 1950</a>. During production, which took place in Italy, <a href="http://www.tcm.com/this-month/article/60080%7C0/Stromboli.html" target="_hplink">she fell in love with Rossellini</a>, who was also married at the time, and became pregnant with their son. A scandal ensued, culminating in <a href="http://www.tcm.com/tcmdb/person/14558%7C72764/Ingrid-Bergman/biography.html" target="_hplink">Bergman being denounced</a> by the U.S. Congress and virtually blacklisted by the U.S. film industry. <a href="http://www.huffingtonpost.com/2011/05/21/arnold-schwarzenegger-hollywood-scandals_n_864932.html#s281464&title=Fatty_Arbuckle" target="_hplink">"Hollywood wouldn't touch her,"</a> said James Robert Parish, the author of "The Hollywood Book of Scandals." Bergman and Rosselini married in May 1950 and later had twin daughters, but they didn't return to Hollywood <a href="http://thehairpin.com/2011/04/scandals-of-classic-hollywood-ingrid-bergman-instrument-of-evil/" target="_hplink">until the late '50s</a>.
Jennifer Lopez and Ben Affleck
Ben Affleck and Jennifer Lopez, also known as "Bennifer", <a href="http://www.usatoday.com/life/people/2004-01-23-bennifer-timelilne_x.htm" target="_hplink">met on the set of box-office bomb "Gigli" in early 2002</a>, while Lopez was married to her second husband, Cris Judd. Three days before Lopez filed to divorce Judd in July 2002, <em>People</em> reported that the actress was <a href="http://www.people.com/people/archive/article/0,,20137732,00.html" target="_hplink">already introducing Affleck as her "new boyfriend" to friends</a>. Though the couple became engaged in November 2002, in the end, Bennifer couldn't stand the test of time; by January 2004, <a href="http://www.usatoday.com/life/people/2004-01-22-bennifer-breakup_x.htm" target="_hplink">the relationship was over for good.</a>
Meg Ryan and Russell Crowe
In July 2000, Meg Ryan and Dennis Quaid <a href="http://www.ew.com/ew/article/0,,276771,00.html" target="_hplink">announced they were separating</a> amid allegations of an affair between Ryan and her "Proof of Life" co-star Russell Crowe. A month before the filing, Ryan and Crowe (pictured here with director Taylor Hackford) were <a href="http://www.people.com/people/archive/article/0,,20131801,00.html" target="_hplink">reportedly seen "cuddling, hugging, kissing" on set</a>. Quaid and Ryan's <a href="http://blog.sfgate.com/dailydish/2008/09/29/quaid-denies-ryan-is-moving-for-full-custody-of-son/" target="_hplink">divorce was finalized in 2001</a>. Meanwhile, the actress' relationship with Crowe reportedly <a href="http://www.usmagazine.com/celebrity-news/pictures/stars-caught-cheating-2009318/2771" target="_hplink">fizzled out after a few months</a>.
Humphrey Bogart and Lauren Bacall
Humphrey Bogart was 44 and married to Mayo Methot when he met and fell for 19-year-old <a href="http://books.google.com/books?id=zlSRS80XIfQC&pg=PT642&lpg=PT642&dq="To+Have+and+Have+Not"+"married+to+Mayo+Methot"&source=bl&ots=iIBF1o-Vfi&sig=6-yaGWpuYckWqpBwEIGtuYiUaLs&hl=en&sa=X&ei=I0oQUK7lAu3siwKq34GIDg&ved=0CEwQ6AEwAjgK#v=onepage&q="To Have and Have Not" "married to Mayo Methot"&f=false" target="_hplink">Lauren Bacall weeks into shooting 1944's "To Have And Have Not."</a> Within months, Bogart <a href="http://www.biography.com/people/lauren-bacall-9194111" target="_hplink">divorced Methot and married</a> Bacall in May 1945. The pair remained married until <a href="http://entertainment.time.com/2012/07/06/reel-love-top-10-movies-that-begat-off-screen-romances/slide/to-have-and-have-not/#to-have-and-have-not#ixzz21fTjc7Nw" target="_hplink">Bogart's death, from esophageal cancer</a>, in 1957.
Penelope Cruz and Tom Cruise
Soon after his split from Nicole Kidman, Tom Cruise co-starred with Penelope Cruz in Vanilla Sky, and before long she was on his arm in real life, too. Director Cameron Crowe was delighted with this development, saying it was wonderful "watching them fall in love in front of your eyes". And the additional publicity for the film didn't hurt either.
Tom Cruise and Nicole Kidman
What goes around... Tom Cruise was married to Mimi Rogers when he met Nicole Kidman on the set of <em>Days of Thunder</em>. With Cruise-like calmness, he announced to Mimi, "I'm with Nicole now."
Kenneth Branagh and Helena Bonham Carter
After his divorce from Emma Thompson, Kenneth Branagh was in a relationship with Helena Bonham Carter, whom he directed and starred with in <em>Mary Shelley's Frankenstein.</em>
Brad Pitt and Gwyneth Paltrow
Before he was swept into Angelina's arms, Brad Pitt and Gwyneth Paltrow were almost identical in appearance, having teamed up on the set of thriller <em>Seven</em>.
Angelina Jolie and Billy Bob Thornton
And long before she caused such ripples in the Aniston-Pitt household, Angelina Jolie was causing simliar challenges on the set of <em>Pushing Tin</em>, where she met Billy Bob Thornton. Soon they were swapping vials of each other's blood, and his marriage to Laura Dern was over.
Jennifer Aniston and Vince Vaughn
After she split from Brad Pitt, Jennifer Aniston found solace in the arms of her <em>Break Up</em> co-star Vince Vaughn. "He brought me back to life," she said afterwards.
Rachel Weisz and Daniel Craig
Both were with other people in long term relationships, but the long-standing friendship between Rachel Weisz and Daniel Craig turned to love on the set of <em>The Dream House</em>, and they were married within the year.
Jennifer Aniston and Justin Theroux
Jennifer Aniston again... she obviously spends a lot of time working... this time on the set of <em>Wanderlust</em>, where she met co-star Justin Theroux. The pair have been inseparable ever since, and Ms Aniston appears to have even slowed down her work rate.
Kate Beckinsale and Len Wiseman
Things got sticky on the set of Waterworld, when star Michael Sheen's partner and co-star Kate Beckinsale fell for their director Len Wiseman. Being British, this was all handled with impeccable civility, and the three all live in Los Angeles, so that both parents can share the upbringing of their daughter Lily.
Emma Stone and Andrew Garfield
Although they have never publicly admitted their relationship, the chemistry between Emma Stone and <em>Spiderman</em> co-star Andrew Garfield was evident both on screen and during the ensuing worldwide junket - oh, and in pictures of them kissing their way around New York.
Anna Friel and Rhys Ifans
Rhys Ifans, lovelorn after being dumped by Sienna Miller, found solace with his <em>Neverland</em> co-star Anna Friel.