They announced the birth on their website, saying, "Mother and son are doing well." The couple hasn't revealed a name yet, but promised not to name him South.
Kardashian was due on Christmas, but after she experienced contractions Friday night, she posted a selfie (naturally) with the caption, "Ready when you are lol." Given her struggles with this pregnancy - including in vitro fertilization and the baby being breech initially -- we're very happy for the family that all went well.
Now, fill us in on that name -- and show us the pics!