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It's the very definition of "estrangement": Following months of turmoil that culminated in Lamar Odom's DUI and a much-contested brief rehab stay, Khloe Kardashian has no idea where her husband of nearly four years is.

"Khloe doesn't know where Lamar is," a source close to Kardashian, 29, told Us Weekly late Thursday, Sept. 5. "She's just exhausted. I don't think anyone knows where he is at this point." The source adds that Khloe "cut him off" following a heated showdown over a week ago, in which she confronted Odom about his drug addiction and reported affairs with other women. "She said get out, go get help," the source says.

And, according to a different source -- this one close to Odom -- the basketball player did seek help, briefly entering a rehab facility before checking himself out on Thursday.

Khloe and her famous family, however, have been left out of the loop, and are unsure whether he was ever truly in a facility. "She's not fazed by these reports," the Khloe source contends. "She doesn't believe it, she doesn't think he went to rehab. Khloe is so exhausted by everything. She doesn't know what's going on."

Still, as usual, the Keeping Up with the Kardashians star is keeping her chin up -- at least on Twitter. "I love you! Thank you for loving me!" she tweeted late Thursday.