Confirmed the news to 222 million followers on Instagram
The welcome news comes not long after Kardashian and Barker made public that they had stopped IVF treatment but were still trying to have a baby together.
Kourtney Kardashian held up a sign reading "Travis I'm pregnant" at the Blink-182 show
Kardashian and Barker are already parents to 6 children.
"We are officially done with IVF " Kourtney said in May on her reality show.
They shared a kiss while tens of thousands cheered the news.