Sometimes it just isn't meant to be, and that seems to be the case for a number of Tinseltown's biggest couples.

Heartache abounds in 2013 -- many of our once-favorite couples were left with broken engagements, divorce announcements, or just plain nasty breakups. And while some of these un-pairings we expected, others caught us completely by surprise. Grab a tissue and relive the year in celebrity splits:

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  • Julianne Hough & Ryan Seacrest

    <a href="http://www.huffingtonpost.com/2013/03/16/ryan-seacrest-julianne-hough-split_n_2890436.html" target="_blank">Things were over in June</a> for Julianne Hough and Ryan Seacrest, after dating for close to three years.

  • Britney Spears & Jason Trawick

    Britney Spears <a href="http://www.huffingtonpost.com/2013/01/11/britney-spears-jason-trawick-split-ends-engagement-report_n_2459876.html" target="_blank">ended her engagement to Jason Trawick in January</a>, after dating for three years.

  • Justin Bieber & Selena Gomez

    Justin Bieber and Selena Gomez <a href="http://www.huffingtonpost.com/2013/01/04/justin-bieber-selena-gomez-split-break-up-again-new-years_n_2408778.html" target="_blank">split for the second time</a> just after New Year's. Teenyboppers everywhere sobbed.

  • Br adley Cooper & Zoe Saldana

    Bradley Cooper and Zoe Saldana <a href="http://www.huffingtonpost.com/2013/01/03/bradley-cooper-zoe-saldana-break-up-couple-call-quits-again_n_2402013.html" target="_blank">called it quits for the second time in January, after initially dating for three months in 2012. </a>The pair first split in March 2012 and reconciled in September of that year.

  • Ashley Judd & Dario Franchitti

    After 12 years together, <a href="http://www.huffingtonpost.com/2013/01/30/ashley-judd-dario-franchitti-divorce_n_2580690.html" target="_blank">Ashley Judd and Dario Franchitti announced their divorce</a> in January, although it's <a href="http://www.huffingtonpost.com/2013/10/07/ashley-judd-ex-husband-dario-franchitti_n_4059908.html" target="_blank">unclear if they have since reconciled. </a>

  • Michael Sheen & Rachel McAdams

    Michael Sheen and Rachel McAdams <a href="http: //www.huffingtonpost.com/2013/02/27/rachel-mcadams-michael-sheen-break-up_n_2772707.html?utm_hp_ref=celebrity-splits" target="_blank">broke up in February</a>. They met on the set of "Midnight in Paris" and dated for two years.

  • Michelle Williams & Jason Segel

    Michelle Williams and Jason Segel <a href="http://www.huffingtonpost.com/2013/03/01/michelle-williams-jason-segel-split-breakup_n_2789211.html" target="_blank">ended their relationship in March</a> after dating for nearly a year.

  • Kristen Stewart & Robert Pattinson

    Though there have been rumors of reconciliation, Kristen Steward and Robert Pattinson <a href="http://www.huffingtonpost.com/2013/05/19/kristen-stewart-robert-pattinson-split_n_3302382.html" target="_blank">called it quits in May</a>.

  • Nina Dobrev & Ian Somerhalder

    "Vamipire Diaries" co-stars Nina Dubrov and Ian Somerhalder<a href="http://www. huffingtonpost.com/2013/05/09/nina-dobrev-ian-somerhalder-split-breakup_n_3244430.html" target="_blank"> broke things off in May</a>, after dating for three years.

  • Kat Von D & Deadmau5

    Tattoo artist Kat Von D and producer Deadmau5 <a href="http://www.huffingtonpost.ca/2013/06/27/deadmau5-kat-von-d-split-cheating_n_3509721.html" target="_blank">ended their engagement</a> in June. She announced the split via Twitter, insinuating he cheated on her.

  • George Clooney & Stacy Keibler

    George Clooney & Stacy Keibler <a href="http://www.huffingtonpost.com/2013/07/08/george-clooney-stacy-keibler-split_n_3562043.html" target="_blank">ended their relationship in July</a> after two years together.

  • Catherine Zeta Jones & Michael Douglas

    Catherine Zeta Jones and Michael Douglas <a href="http://www.huffingtonpost.com/2013/08/28/catherine-zeta-jones-michael-douglas-separa te_n_3828657.html" target="_blank">separated in August</a>. Sources said they are "taking a break."

  • Clint & Dina Eastwood

    <a href="http://www.huffingtonpost.com/2013/08/29/clint-eastwood-dina-eastwood-separate_n_3838790.html?utm_hp_ref=celebrity-splits" target="_blank">Clint Eastwood and his wife Dina split</a> in August. They had been together 17 years.

  • Miley Cyrus & Liam Hemsworth

    Reps for Miley Cyrus and Liam Hemsworth c<a href="http://www.huffingtonpost.com/2013/09/16/miley-cyrus-liam-hemsworth-split_n_3936186.html" target="_blank">onfirmed that the couple had split in September</a> after becoming engaged in June 2012.

  • Chelsea Handler & Andre Balazs

    Chelsea Handler and Andre Balazs <a href="http://www.huffingtonpost.com/2013/10/03/chelsea-handler-andre-balazs_n_4038767.html" target="_blank">broke up in October</a> ending a a two-year bicoastal relationship.

  • Bruce & Kris Jenner

    Bruce and Kris Jenner <a href="http://www.huffingtonpost.com/2013/10/09/kris-jenner-bruce-jenner-separate-what-went-wrong_n_4070145.html?utm_hp_ref=celebrity-splits" target="_blank">announced the end of their marriage</a> in October. They had been together for 22 years.

  • Miranda Kerr & Orlando Bloom

    <a href="http://www.huffingtonpost.com/2013/10/25/orlando-bloom-miranda-kerr-split_n_4162443.html?utm_hp_ref=celebrity-splits" target="_blank">Miranda Kerr and Orlando Bloom split</a> in October after three years of marriage. The two released a statement saying they "love, support and respect each other as both parents of their son and as family."

  • Malin Akerman & Roberto Zincone

    Actress Malin Akerman and her rocker husband, Roberto Zincone, <a href="http://www.huffingtonpost.com/2013/11/25/malin-akerman-roberto-zincone-split_n_4340480.html" target="_blank">split in November</a> just months after the birth of their first child.

  • Diane Lane & Josh Brolin

    Diane Lane and Josh Brolin split in February. Their <a href="http://www.huffingtonpost.com/2013/12/02/josh-brolin-diane-lane-divorced_n_4373282.html" target="_blank">divorce was finalized</a> in December.

  • Keri Russell & Shane Deary

    Keri Russell announced her <a href="http://www.huffingtonpost.com/2013/12/05/keri-russell-husband-split_n_4393278.html" target="_blank">separation from her husband of seven years Shane Deary in Decemeber</a>, though reps for the pair revealed they had been separated since the summer.

  • Madonna & Brahim Zaibat

    Madonna and her much young boyfriend <a href="http://www.huffingtonpost.com/2013/12/11/madonna-brahim-zaibat-split_n_4427341.html" target="_blank">called it quits in December</a> after dating since 2010. < /p>

  • Idina Menzel & Taye Diggs

    Taye Diggs and Idina Menzel <a href="http://www.huffingtonpost.com/2013/12/11/taye-diggs-idina-menzel-separate_n_4429561.html" target="_blank">decided to called it quits after 10 years of marriage, announcing in December</a> that they are separated from one another.

  • Khloe Kardashian & Lamar Odem

    Khloe Kardashian<a href="http://www.huffingtonpost.com/2013/12/13/khloe-kardashian-files-divorce_n_4440521.html" target="_blank"> filed for divorce from Lamar Odom on Dec. 13</a>, ending their 3 year marriage.