Lamar Odom may be keep a dark secret from the public, one that may possibly be the reason behind his rumored separation to wife Khloe Kardashian.

Sources told TMZ that Odom is allegedly battling a crack addiction, a secret Khloe has reportedly tried to keep from the Kardashian family.

"Khloe did not want to burden her family and jeopardize the Kardashian machine by telling the brood about Lamar's drug issues," TMZ reports.  "We're told Kourtney and Kim Kardashian learned of Lamar's addiction 'very recently.'"

Khloe allegedly did not tell her mother Kris Jenner either, and has tried to figure out the extent of Odom's addiction on her own.

"Our sources say Khloe told private investigators Lamar was addicted to 'performance enhancing drugs' and that's why she needed their help," TMZ reports.  "She never played the crack card."

Rumors of cheating allegations and divorce have plagued Khloe and Odom's relationship for several months now.  There have been no official confirmations that Odom has used drugs, cheated on Khole or that the couple has legally separated.

Still, that hasn't stop the Internet from speculating about their relationship.  According to PerezHilton.com, Odom was reportedly seen placing luggage into a friend's SUV.  One of Khloe's best friends was seen giving him the luggage, igniting rumors that Khloe kicked him out of the house. 

"When stories started to surface about Lamar sleeping with other women ... and the family started asking questions ... ," a source told TMZ.  "Khloe felt she needed to reveal the real issue. As one source put it, "Khloe was a real trooper. She's been living a nightmare."

Khloe was also recently spotted leaving a gym without her wedding ring, and that may be a sign that her marriage is over.

What do you think of Odom's drug abuse rumors and allegations? Leave a comment below!