RGA / ZOJ / WENN 1 / 16
RGA / ZOJ / WENN 1 / 16

Where's Lamar? Lamar Odom may not be in a rehab facility after all, two sources tell Us Weekly. The whereabouts of Khloe Kardashian's husband are currently unknown, according to one insider. A third source points out that Odom may have "checked himself out" of a rehab last minute.

PHOTOS: Khloe and Lamar in happier times

Late Wednesday, it was widely reported that Odom had quietly checked himself into a facility to treat a serious drug problem -- an addiction that had "taken over" his nearly four-year marriage to reality star Kardashian, 29. After weeks of very visible, public tension, the situation blew wide open just past 3 a.m. on Aug. 30, when Odom was arrested for DUI and refused to take a drug test at the police station.

PHOTOS: Their wedding

For Kardashian, another pal says, "the DUI was a colossal setback. She thought they'd hit rock bottom, but this was a brand-new low." (Last week, friends alleged to Us that Odom struggles with cocaine and other substances.)

At this point, the friend admits, "Khloe is doubtful about her marriage, but wants to save his life."

PHOTOS: Celeb rehab centers

Read much more about Lamar and Khloe's crisis in this week's Us Weekly -- and check this space for updates.

MORE FROM WONDERWALL:

Khloe Kardashian tweets she isn't 'made of steel' after Lamar Odom DUI arrest

Timeline: Lamar Odom's addiction issues

Khloe and Lamar plagued by divorce, cheating rumors