The huge crowd jeered and booed mercilessly when KIM KARDASHIAN’s kisser suddenly popped up on the Jumbotron at LA’s Staples Center as she and KHLOE cheered on baby sis’ hubby, LAMAR ODOM, but Kim put on a brave face until she was off-camera – then burst into tears, burying her face in her hands and sobbing bitterly!

“I just can’t take this pressure anymore,” wailed the reality diva.

“Everyone hates me!”

Mom-ager KRIS JENNER quickly consoled her weeping child, says My SpyWitness, and told her to get it together, wipe her eyes and put a smile on her face…pronto!

Kim kept her head down as Mom and Sis plied her with tissues, then looked up with a brave smile as the camera found her again.

“She was booed encore,” said my source, “but managed to hold back the tears.”