See Kim Kardashian's "Princess Cake" from Engagement Bash


Matrimonial mayhem!

Khloe Kardashian is blogging -- with photos! -- about the night that her big sister Kim broke news of her engagement to Kris Humphries over a casual "family dinner" at mom Kris Jenner's house.

"None of us thought it would be any different from our usual family get-togethers," Khloe, 26, writes. Kim, 30, "walked in late (OF COURSE) and nonchalantly flashed that rock of hers."

(NBA hunk Humphries, 26, proposed with a $1 million, 20.5-carat Lorraine Schwartz stunner.) What happened next?

"We all started screaming!" Khloe explains. "It took us a few minutes to notice, but once we did, then everyone started freaking out."

To mark the occasion, mom Jenner went all out with a "magnificent princess cake" (pictured at left) and "ponies covered in glitter."

"It was such a happy night," gushed Khloe, whose own wedding to Lamar Odom was in October 2009. "So much love in the air. I know that sounds cheesy, but that's the only way to explain it."