We have all witnessed the lifestyle changes Kourtney Kardashian has undergone after having children. She is much more calm, centered and out completely there. Just remember that time she willingly watched a home birth and was obsessed with oil enemas for evidence.

However, she is truly a terrific mom and always puts her kids first, even above her family's multi-million dollar deals - for example the $100 million dollar deal The Celebrity Cafe revealed a month or so ago.

When she had her first son, Mason, she was very open about her pregnancy and post-pregnancy life. She even allowed Mason to star on Kourtney and Khloe take Miami. Naturally, we were all obsessed with Mason because he is basically the cutest child ever born. No one was more obsessed with Mason, however, than his own mum.

Once Kourt settled into motherhood, she instantly wanted another child, just ask Scott Disick. She is completely addicted to everything maternal at this point in her life. But, when she had her first daughter, Penelope, she was much more reserved in sharing her experiences and opening up her baby's life to the public. P was hardly ever shown on the show as a little tot and now, in their 10th season of the show, P is rarely on screen.

So when Kourtney announced she was pregnant with her third child, we didn't really expect her to share anything and our expectations were met. Her youngest son, Reign Aston Disick, has been out of the spotlight until today!

Kourtney has finally shared his unbelievable cuteness with the Instagram world, Yahoo Celebrity reports. The picture has been up for 5 hours and already has 937K likes...NBD.

How cute is he?! This picture is a huge step further than her first photo of Reign, which she also shared on Instagram.

You have to admit that she and Scott really make some adorable babies. Mason, 5, and Penelope, 2, are growing up so fast and get cuter by the day (and episode of KUWTK). Mason's already hanging out with international superstars and what not, so we can only imagine what he'll be up to when he gets into his teenage years.