Kimora Lee Simmons is going through her second divorce ... because her estranged husband just filed to officially pull the plug on their marriage.

"Big Brother" star Mickey Lee is facing a terrifying health scare -- she's suffered multiple cardiac arrests after complications from the flu -- landing her in critical but stable condition.

Paris Jackson and her music producer fiancé Justin Long are NOT going to be walking down the aisle ... because they've called off their engagement.