Josh Brolin And Diane Lane(01 of21)
Open Image ModalThe celebs: Josh Brolin and Diane LaneThe history: Married for eight years, together for 11The reason: "The relationship just ran its course," said their repsShown Sunday Jan. 29, 2012 (credit:AP Photo/Chris Pizzello)
Miley Cyrus And Liam Hemsworth(02 of21)
Open Image ModalThe celebs: Miley Cyrus And Liam HemsworthThe history: Engaged for one year, together for fiveThe reason: "I don't think I realized what 19 really is and I got engaged at 19," Cyrus told Barbara Walters. "I was so scared of ever being alone."Shown Aug. 8, 2013 (credit:Jordan Strauss/Invision/AP))
Michael Douglas And Catherine Zeta-Jones(03 of21)
Open Image ModalThe celebs: Michael Douglas And Catherine Zeta-JonesThe history: Married for 13 years, have two childrenThe reason: They've had a rough past three years, with his cancer battle and her bipolar being made public, but it may have been blaming his cancer on oral sex that was the final straw. However, no legal papers have been filed by either at this point.Shown Feb. 24, 2013 (credit:Carlo Allegri/Invision/AP, File)
Khloe Kardashian And Lamar Odom(04 of21)
Open Image ModalIdina Menzel And Taye Diggs(05 of21)
Open Image ModalThe celebs: Idina Menzel And Taye DiggsThe history: Married for 10 years, have one sonThe reason: "Idina Menzel and Taye Diggs have jointly decided to separate at this time," say reps.Shown March 21, 2012 (credit:Photo by Jason Merritt/Getty Images for Alzheimer's Association)
Miranda Kerr And Orlando Bloom(06 of21)
Open Image ModalThe celebs: Miranda Kerr And Orlando BloomThe history: Married for three years, have a sonThe reason: "Life sometimes doesn't work out exactly as we plan or hope for," Bloom told Katie Couric. "But we're adults ... We're professionals."Shown Feb. 24, 2013 (credit:Jordan Strauss/Invision/AP)
Jay Baruchel And Alison Pill(07 of21)
Open Image ModalThe celebs: Jay Baruchel And Alison PillThe history: Engaged for two yearsThe reason: Long-distance relationship seems to the culprit, as Baruchel wanted to live and work in Canada, while Pill felt opportunities were elsewhere. He didn't take it wonderfully, though, tweeting: "Alone again, naturally. Heartbroken. I won't be on twitter for awhile gang. Getting dumped rules."Shown April 25, 2011 (credit:Henry S. Dziekan III/Getty Images)
Clint Eastwood And Dina Ruiz(08 of21)
Open Image ModalNina Dobrev And Ian Somerhalder(09 of21)
Open Image ModalThe celebs: Nina Dobrev And Ian SomerhalderThe history: Dated for three yearsThe reason: Somerhalder has claimed he doesn't like dating co-stars, though recent rumours have linked the pair again.Shown March 10, 2012 (credit:AP Photo/Dan Steinberg)
Kris Jenner And Bruce Jenner(10 of21)
Open Image ModalThe celebs: Kris Jenner And Bruce JennerThe history: Married 22 years, 2 childrenThe reason: "We came to a place where this isn’t healthy, the way we were treating each other," Kris told Kathie Lee Gifford.Shown March 2, 2010 (credit:AP Photo/Matt Sayles, File)
Nigella Lawson And Charles Saatchi(11 of21)
Open Image ModalRupert Murdoch And Wendi Murdoch(12 of21)
Open Image ModalThe celebs: Rupert Murdoch And Wendi MurdochThe history: 14 years of marriage, 2 daughtersThe reason: Apparently they had been living "largely separate lives" in recent years.Shown Jan. 15, 2012 (credit:AP Photo/Matt Sayles, File)
Stacy Keibler And George Clooney(13 of21)
Open Image ModalThe celebs: Stacy Keibler And George ClooneyThe history: Dated for two yearsThe reason: It ran its course. As Keibler said, "I have fond memories and I had wonderful experiences. It's just time to move on."Shown February 24, 2013 (credit:Michael Buckner/Getty Images)
Kat Von D And DJ Deadmau5(14 of21)
Open Image ModalRyan Seacrest And Julianne Hough(15 of21)
Open Image ModalThe celebs: Ryan Seacrest And Julianne HoughThe history: Dated for almost three yearsThe reason: Apparently "hectic schedules," though rumours have placed the blame on everything from Seacrest's workaholic ways to Hough's partyingShown January 13, 2013 (credit:Jason Merritt/Getty Images)
Jason Segel And Michelle Williams(16 of21)
Open Image ModalAshley Judd And Dario Franchitti(17 of21)
Open Image ModalThe celebs: Ashley Judd And Dario FranchittiThe history: Married 11 yearsThe reason: They "mutually" decided to end the marriage, they said in a statement — though since Franchitti's car crash in October, there have been serious rumours of reconciliation. (credit:Jordan Strauss/Invision/AP)
Jane Seymour And James Keach(18 of21)
Open Image ModalThe celebs: Jane Seymour And James KeachThe history: Married for 20 yearsThe reason: No reason given, except that they'd been separated for many months by the time they started divorce proceedings. They've continued to be on red carpets at charity event together.Shown April 21, 2012 (credit:Angela Weiss/Getty Images For The Open Hearts Foundation)
Malin Ackerman And Roberto Zincone(19 of21)
Open Image ModalThe celebs: Malin Ackerman And Roberto ZinconeThe history: Married for six years, one 7-month-old sonThe reason: "Irreconcilable differences"Shown January 13, 2013 (credit:Jason Merritt/Getty Images)
Taylor Swift And Harry Styles(20 of21)
Open Image ModalMichael Sheen And Rachel McAdams(21 of21)
Open Image ModalThe celebs: Michael Sheen And Rachel McAdamsThe history: Dated for two yearsThe reason: Long distance — McAdams lives in Toronto, and while the couple never spent "more than three weeks apart," it must have worn on themShown April 11, 2012 (credit:AP Photo/Joel Ryan)