The players: Kristen Stewart, Rupert Sanders, Robert Pattinson and Liberty Ross
13 Images

Hollywood love triangles

The players: Kristen Stewart, Rupert Sanders, Robert Pattinson and Liberty Ross

“Twilight Saga” darling Kristen Stewart rocked the Robsten world when she issued a public apology Wednesday for a “momentary indiscretion” with Rupert Sanders, the married director of her recent film “Snow White and the Huntsman.” Stewart, who has been dating her “Twilight” costar Robert Pattinson for years, apparently had a “marathon makeout session” with Sanders, who is married to Liberty Ross. She did not deny the affair and instead issued the prompt apology, which was followed by an apology from Sanders saying that he was “utterly distraught about the pain” he caused his family.”

Being rich and famous doesn’t make dating and love any easier. Love triangle scandals have trailed many a star, and the Robsten incident highlights how infidelity can forever shadow a celebrity. More details are just one click away, evidence that Stewart’s drama isn’t exactly atypical.

Director Rupert Sanders with wife Liberty Ross, left, and actress Kristen Stewart, right.

 (Getty Images / Associated Press)
<b>The Players:</b> Billy Crudup, Mary-Louise Parker and Claire Danes
What went down: It turns out actor Billy Crudup really is all about the drama. The thespian was expecting his first child with longtime girlfriend Mary-Louise Parker in 2003 when he dumped her after seven years together. It seemed Crudup, who met Parker during a 1996 revival of William Inge’s play “Bus Stop,” had fallen for another actress. In 2004 he confirmed he was dating his “Stage Beauty” costar Claire Danes, although the couple denied an affair. The relationship eventually dissolved in 2006. (From left: Showtime; Getty Images; Andrew H. Walker / Getty Images)
<b>The Players:</b> Ingrid Bergman, Roberto Rossellini and Aron Petter Lindstrom
What went down: Ingrid Bergman was a full-fledged star by 1949 when she contacted famed Italian director Roberto Rossellini, with Bergman above, about making a film together. Rossellini cast her in “Strombolini,” and the pair quickly fell in love behind the scenes. Soon after, Bergman became pregnant. The problem? She already had a husband, a dentist named Aron Petter Lindstrom, and a daughter named Pia. When the scandal broke, Bergman was dropped from television appearances, denounced on the U.S. Senate floor and eventually moved to Italy. Once her divorce was final, Bergman married Rossellini, and the two had a son and twin daughters together (including actress Isabella Rossellini). (J.R. Eyerman)
<b>The Players:</b> LeAnn Rimes, Eddie Cibrian and Dean Sheremet
What went down: Country songbird LeAnn Rimes married backup dancer Dean Sheremet in 2002, but the marriage fell apart when she had an affair with Eddie Cibrian, above, her costar in made-for-TV movie “Northern Lights” in 2009. Cibrian, married with two children, filed for divorce that same year, while Rimes’ divorce from Sheremet was finalized in 2010. (Dan Power / Lifetime)
<b>The Players:</b> Britney Spears, Kevin Federline and Shar Jackson
What went down: Britney Spears started looking more like a home wrecker than a pop princess in 2004 when she fell for backup dancer Kevin Federline. The scandal broke when he walked out on his pregnant girlfriend, Shar Jackson, and their daughter Kori to be with the singer. The pair eventually filmed a reality show, got married and had two children of their own before a major split in 2007.

K-Fed manned up in 2010 and apologized to Jackson for his “selfish” ways, during an episode of VH1’s “Celebrity Fit Club.” (Frazer Harrison / Getty Images)
<b>The Players:</b> Brad Pitt, Angelina Jolie, Jennifer Aniston
What went down: Were Brad Pitt and Angelina Jolie playing house behind Jennifer Aniston‘s back? That’s the popular perception after Pitt and Jolie hit it off so well on the set of “Mr. and Mrs. Smith.” Though there were apparently problems between Pitt and Aniston before the movie started -- rumors about Pitt wanting a family and Aniston wanting to put it off -- nothing was ever really confirmed in terms of why the couple broke up. But it was very, even conveniently, soon after that Pitt and Jolie were adopting and having babies. (Gary Friedman / Los Angeles Times)
<b>The Players:</b> Kate Beckinsale, Len Wiseman, Michael Sheen
What went down: “Underworld,” indeed. Playing a leather-bound vampire soldier, actress Kate Beckinsale went into the filming of the vampires vs. werewolves saga with longtime boyfriend, fellow Brit Michael Sheen (the David Frost of “Frost/Nixon”), as her costar. Maybe it was Len Wiseman’s excellent direction of the movie, but Beckinsale broke it off with Sheen, with whom she had a daughter, during the movie production and soon after began a relationship with Wiseman. The two married a year later. Beckinsale recently signed on to “Underworld 4.” (Kevin Winter / Getty Images)
<b>The Players:</b> Woody Allen, Soon Yi, Mia Farrow
What went down: Woody Allen and Mia Farrow were together for 12 years until they split due to Allen’s desire to be with (romantically) her adopted daughter from a previous marriage, Soon Yi Previn. Scandal! Through court cases involving child-abuse charges and custody battles, Allen and Previn -- 35 years separating them -- remained together and wed six years after their relationship went public. (Juan Naharro Gimenez / Getty Images)
<b>The Players:</b> Johnny Cash, June Carter Cash and Vivian Cash
What went down: In short, a ring of romantic fire. Johnny Cash married the young Vivian after he was discharged from the military in 1954. Four children and 12 years later, Vivian filed for divorce. The problem? Cash was not only constantly touring but also spending plenty of time with June Carter, with whom he was said to be having an affair. Two years after Johnny and Vivian divorced in 1966, Johnny and June were married. The song “Ring of Fire,” which is credited to Johnny and June, is said to be about the love triangle. (Getty Images)
<b>The Players:</b> Eric Clapton, Pattie Boyd and George Harrison
What went down: If rock ‘n’ roll myths are to be believed, Pattie Boyd is responsible for many a hit tune. Most notably, perhaps, “Layla” by Eric Clapton. The song was cut in 1970 and released on Derek and the Dominos’ “Layla and Other Assorted Love Songs.” At the time, Clapton was believed to be infatuated with Boyd, whom Harrison had met while filming “A Hard Day’s Night” and later married. Boyd rebuffed Clapton’s advances, although the two were friends, and when her relationship with Harrison went south, Clapton and Boyd’s friendship became a romance. One problem: Clapton, according to many accounts from Boyd, was struggling with illegal substances at the time, and the artist’s refusal to seek help is one reason the relationship ultimately fell apart. However, while married to Boyd, Clapton had numerous affairs, even having a daughter with Yvonne Kelly while married to Boyd. The pair divorced in 1989. (Charles Rex Arbogast / Associated Press)