Kylie Jenner gave birth last week to a baby girl Stormi and revealed the news last Sunday.
However, in her eleven minute video it showed all of her family were involved and were part of keeping her secret.
However, it seems like not all of her family knew.
Kylie's half-brother Brody Jenner has revealed he found out when the rest of the world did.
Brody told TMZ that he "didn't even know she was pregnant for the entire pregnancy."
The Hills star admitted he hasn't been in touch with Kylie or the Jenner/Kardashian family for a few years but that he would love to meet the new baby.
Brody and Kylie share Caitlyn Jenner as a parent and Caityln took to Instagram this week to share her excitement at Kylie's news.