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10:39 AM PST, December 29, 2011
CarsonandTarareportedly began dating in March 2000 and remained hot and heavy during a one-and-a-half-year relationship. The couple even got engaged but canceled their wedding plans and split in mid 2001.
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Carson Daly & Tara Reid

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Carson and Tara reportedly began dating in March 2000 and remained hot and heavy during a one-and-a-half-year relationship. The couple even got engaged but canceled their wedding plans and split in mid 2001.
Cameron Diaz & Matt Dillon

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Cameron and Matt began dating in the late 1990s and reportedly were engaged before breaking their wedding plans and splitting up after a 3-year relationship.
Ben Affleck & Jennifer Lopez

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This Hollywood couple was such a media sensation they were actually dubbed "Bennifer." They began dating in 2002 after meeting on the set of 'Gigli.' Despite a potential fairy-tale wedding planned for September 14, the couple broke their engagement and split up in 2004.
Sienna Miller & Jude Law

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It was announced last February that Jude and Sienna had split after a tumultuous seven-year relationship. The couple first began dating in 2003, got engaged about a year later, then broke up in 2006 after Jude had an affair with a nanny. The two had reconciled again in the fall of 2009 after the scandal.
Alanis Morissette & Ryan Reynolds

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Ryan and Alanis began dating in 2002 and got engaged two years later. They two reportedly split in June 2006, but were seen months later in public holding hands and looking happy. But in February 2007, they made it official in a joint statement that their engagement was off.
Lance Armstrong & Sheryl Crow

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Lance and Cheryl's much anticipated wedding was called off in February 2006 after a two-and-a-half-year relationship.
Karina Smirnoff & Maksim Chmerkovskiy

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This "Dancing with the Stars" couple got engaged in December 2008, with a wedding planned for June 2010, but announced about nine months the wedding was off and they were splitting up.
Rachel Bilson & Hayden Christensen

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Hayden and Rachel got engaged in December 2008 but announced they were "taking a break" in June of last year. They officially announced their engagement was called off last August.
Bristol Palin & Levi Johnston

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Bristol, the daughter of Republican politician Sarah Palin, called off their first engagement two weeks after welcoming their son Tripp in December 2008. They famously announced another engagement in July 2010, but these plans were canceled just a few weeks later.
Julia Roberts & Kiefer Sutherland

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Julia and Kiefer's wedding was much anticipated in Hollywood in June 1991, with hundreds of A-list celebrities planning to attend perhaps the wedding of the year. But just three days before the ceremony, Julia got cold feet and decided to split amid rumors that Kiefer had been having an affair with a stripper.
Katie Holmes & Chris Klein

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After a five-year relationship, Katie and Chris ended their engagement in 2005.
Brad Pitt & Gwyneth Paltrow

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This handsome Hollywood power couple dated for about three years before calling off their engagement in 1997.
Broken Hearts Club

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High profile divorces are notoriously common in Hollywood, but take a look at these couples who called off their fairy-tale weddings before they even walked down the aisle.