Khloe Kardashian isn't shocked Lamar Odom's ex-fiancé is on Tristan Thompson's hook up list ... she knew already, and Tristan's tryst with Sabrina Parr happened way before they even met.
Lamar spilled the beans on Tristan's hook up with Sabrina to Wendy Williams Thursday, but he wouldn't give a timeline. The announcement had many believing it was one of the factors that led to Lamar and Sabrina's split ... and the first time that Khloe was made aware of the situation.
Sources with direct knowledge tell TMZ .