Lamar Odom — NOT In Rehab

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Lamar Odom has NOT checked himself in to rehab … sources connected to the NBAer tell our sources.

There are reports out that Lamar checked himself in … we”ve been making calls for the last day and just got what we”re told is the definitive word … he”s not there.

Lamar has gone off the radar with the Kardashian family for the last few days.  Khloe — who has made it clear she will end the marriage if he doesn”t get help — has heard nothing from him.