Khloe Kardashian Files For Divorce From Lamar Odom (UPDATE)

Khloe Kardashian has filed for divorce from estranged husband Lamar Odom after four years of marriage, TMZ reports.

The reality star filed divorce papers Friday (Dec. 13) to split from Odom.

"It was a recent decision," a source close to the couple told People magazine. "She's been holding out hope but she has to look out for herself."

Reports surfaced early Friday that the 29-year-old would finally end their union after spending months apart from the NBA star, who has reportedly been battling drug addiction.

"Khloe has been very, very hurt by everything," a source previously told E! News about the relationship. "There is a lot about Lamar that she is just learning and if they have any chance of making this work, there is a lot they need to come to terms with."

The reality star married the former Los Angeles Lakers player back in 2009 after just one month of dating. Problems first arose this past summer when it was reported Odom went missing. TMZ claimed he was using crack cocaine. Since then, the two have been living apart. Last month, a bizarre video surfaced showing Odom rapping, saying: "And when Khloe's out of town/ I still be on the DL."

Their marital issues will play out on Season 9 of "Keeping Up With the Kardashians," a teaser released earlier this month revealed. Last season hinted at some major trouble in paradise, with Odom acting paranoid and Kardashian discussing the disease of drug addiction.

"Lamar has been having a really tough time lately, and it’s not just black and white," Kardashian said in one episode. "There’s a lot of emotional issues. It’s really scary when nothing’s really working and then you know, if you give up, no one in his life would be able to help."

Kardashian has been posting telling quotes to her Instagram account for months. Her most recent ones have been particularly emotional. On Thursday (Dec. 12), she uploaded one about being foolish.

UPDATE: TMZ reports that in the legal documents, Khloe cites "irreconcilable differences." TMZ adds that Khloe is asking the judge to take Odom out of her name, but is not asking for spousal support.