Kourtney Kardashian named her third child with honey dovey Scott Disick Reign Aston Disick.

Kourtney Kardashian just can't hide her happiness with the familial bliss that she's found in the arms of her longtime boyfriend, Scott Disick, and their newborn baby.

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The eldest of the famous Kardashian sisters, who just gave birth to her third child, expressed her great joy via Instagram on Sunday, sharing the first pic of their of her cute baby.

"Madly in love with my little Reign Aston Disick," she captioned after posting a pic showing her holding her newborn baby's hand.

The baby was born on their eldest son, Mason's fifth birthday, Dec. 14.

The baby boy follows the couple's eldest son, five-year-old Mason, and daughter, two-year-old Penelope.

"The family is freaking out with joy. What an amazing coincidence," a source close to the mom-of-three told E! News.

News of the 35-year-old star's pregnancy hit the news last June, surprising Disick at the debut episode of their reality TV show, Kourtney & Khloe Take the Hamptons.

In an interview with Natural Health magazine for its September/October issue, the star talked about how motherhood made her feel better about herself: "I used to get Google Alerts to be aware of what was being said [about me], but it was just a waste of time," Kardashian said.

 "[My kids] make it really easy for me not to pay attention."

Meanwhile, her sister, Kim Kardashian noted that Kourtney is a low-key mom and she's learned a lot from her parenting style.  She also compared that while she's "fun and playful," Kourtney "does more of an attached parent style where her kids sleep in her bed with her."

TagsKourtney Kardashian, Scott Disick