In an unearthed clip from Keeping Up With The Kardashians, Kourtney and her baby daddy Scott Disick urged then-teen Kylie Jenner to use protection two years before she got pregnant.
Ever the caring big sister, Kourtney and her then-boyfriend were quick to warn the teen not to have unprotected sex.
Kylie, 24, welcomed her second child with boyfriend Travis Scott last month, but it has now resurfaced that her big sister told her not to get pregnant.