According to E! News, both Khloe and Lamar attended the concert at Los Angeles' Staples Center, but while they were both in the same arena, they never actually went near each other.
Lamar was in a private suite with his dad and some male buddies, while Khloe sat somewhere else.
While Khloe did post some pics from the Beyonce concert at the same venue just a few days earlier, she never mentioned going to the Jay-Z concert, which is a little unusual for the social media savvy reality star.
Maybe she didn't know Lamar was going to be there, too, and just wanted to pretend like the whole thing never happened?
There had been rumors that Khloe and Lamar were going to couples therapy to try to patch things up, but the near miss on Monday night doesn't sound too promising.
Do you think Khloe and Lamar are done?
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Gallery | Khloe Kardashian and Lamar Odom: A Look Back