Kim is reported to have been suffering from flu and pneumonia for the past week.
Our hearts are with Diddy and all of Porter's loved ones as more details come to light.
Despite being seen on social media and at various events supporting her family, Kim was reportedly battling pneumonia for weeks, but her cause of death is now unknown.
Porter leaves behind twin girls, Jessie James and D'Lila; and a son, Christian Combs - all fathered by Diddy.More news: Marvel co-creator Stan Lee has died
Rihanna shared this post: "this is heavy. heartbroken about this man".
Other celebrities posting about her include Viola Davis and Kevin Hart. "I ask that you give the families privacy at this time", the rapper's rep Cindi Berger told Fox News on Thursday.
"RIP Kim.Your were a lovely person inside and out", Hart's Instagram post read.