Not every romance in Hollywood gets a happily ever after. See the top 10 biggest celebrity splits of 2011.

Ashton Kutcher and Demi Moore

Their six years of marriage ended two months after Kutcher reportedly had a one night stand with San Diego party girl Sara Leal. Moore made the decision and filed for divorce from Kutcher.

"As a woman, a mother and a wife there are certain values and vows that I hold sacred, and it is in this spirit that I have chosen to move forward with my life," she said.

Marc Anthony and Jennifer Lopez

Husband and wife for seven years and parents to twins Max and Emme, the two announced their split on July 15. They said in a statement that it was a very difficult decision.

Kris Humphries and Kim Kardashian

An extravagant wedding nor millions of dollars worth of engagement ring will not guarantee a successful marriage. More than 10 million viewers tuned in to see their wedding exclusive on E! But after 72 days, viewers tune in once again for their divorce.

Ashlee Simpson and Pete Wentz

Last February Simpson filed divorce from Wentz, ending nearly three years of marriage. They said they remain friends and deeply committed in parenting their son, Bronx.

Alex Pettyfer and Diana Agron

The two broke up last February and a source told US Weekly that the "I Am Number Four" star became a loose cannon after his split with Agron.

Ashley Greene and Joe Jonas

The two started dating in mid-2010, but in March, their fire fizzled. A source said Joe wasn't into the relationship, which caused the split.

Zooey Deschanel and Ben Gibbard

The two announced their breakup early November. A source said that the decision was mutual and there was no third party involved.

Jake Gyllenhaal and Taylor Swift

The split happened over New Year's when Jake told a surprised Taylor that the relationship wasn't working out.

Jessica Biel and Justin Timberlake

The A-list couple dated four years before ending their relationship last March. After the split the two remained friends. But a source said that the two rekindled their love four months after.

Leonardo DiCaprio and Bar Refaeli

The gorgeous couple dated on and off for five years before they separated last May. Months after, DiCaprio rebounded with "Gossip Girl" star Blake Lively.

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