Source: Getty / Paul Zimmerman [1]

Kourtney Kardashian and Scott Disick became parents for the third time [2] on Dec. 14, and now they are revealing more about their new baby boy. The reality star gave birth on an already special day: her eldest child Mason Disick's birthday! The new guy and Mason share a sister, Penelope Disick, whom Kourtney and Scott welcomed just two years ago. On Sunday, Dec. 21, Kourtney introduced her son to the public with a tender photo [3], writing, "Madly in love with my little Reign Aston Disick."

Source: Instagram user kourtneykardash [4]

In the final months of her most recent pregnancy, Kourtney followed in her famous sister Kim Kardashian [5]'s footsteps, posing nude in a headline-grabbing photo shoot [6] for DuJour magazine. A few days after the pictures were released, Kourtney revealed the sex of her and Scott's new baby [7] on Kourtney and Khloé Take the Hamptons, saying, "I'm so happy we're having a boy. It's going to be perfect for our family."