Kourtney Kardashian debuts baby Reign in sweet Instagram snap

Kourtney Kardashian and Scott Disickare generally keen to share their lives with the public, but the pair waited nearly four months to introduce their third child to the world. Reality TV star Kourtney posted the first sweet snap of the baby on Instagram on Thursday (April 2), captioning the photo of her smiling little boy: "My little turtle dove angel baby boy Reign Aston Disick."

Given that baby Reign was born on Dec. 14, Kourtney's sweet nickname could have been a reference to the season.

My little turtle dove angel baby boy Reign Aston Disick.

A photo posted by Kourtney Kardashian (@kourtneykardash) on

The couple's firstborn son, Mason, shares a birthday with baby Reign. "The family is freaking out with joy," a source told E! News. "What an amazing coincidence."

Previous to Thursday's Instagram post, 35-year-old Kourtney had only shared a peek at Reign's tiny hand, writing: "Madly in love with my little Reign Aston Disick."

Comments on Kourtney's post from fans included "Absolutely perfect" and "image of his big brother".

Read More: Unusual celebrity baby names

The picture is some good news for Keeping Up With The Kardashian's fans, as it comes on the heels of Scott surprising fans by leaving rehab after just a week. It has been a difficult year for Scott, who is known for his partying ways and has seen them documented in the E! reality show.

Scott Disick and Kourtney Kardashian

The 31-year-old said in a statement at the time: "I realize my issues are bigger than me and I'm ready to truly remedy this struggle I continue to battle."

However Kourtney Kardashian's long-time love has insisted that that was always the plan. Scott, who made the brave decision to enter the facility earlier this month, says he plans to go back to the Rythmia Life Advancement Center at a later date.

"The funny thing is, a lot of people were under the impression that I was going to this rehab facility in Costa Rica for a month," Scott told People magazine. "When the truth was, I was going for a week for one treatment that they have there."

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