Kourtney Kardashian revealed the name of her infant son on Dec. 21. Credit: Paul Zimmerman/Getty Images

Something tells Us Lord Disick was involved in the name selection! Kourtney Kardashian gave birth to her third child, a baby boy, on Dec. 14 — the same day as her son Mason's 5th birthday. 

On Sunday, Dec. 21, she revealed the kiddo's name to be Reign Aston Disick. The reality star, 35, posted a picture on Instagram holding her little boy's hand, captioning it, "Madly in love with my little Reign Aston Disick." 

Madly in love with my little Reign Aston Disick.

A photo posted by Kourtney Kardashian (@kourtneykardash) on Dec 12, 2014 at 8:36am PST

She is already mom to son Mason and daughter Penelope with longtime partner Scott Disick, 31. Since giving birth, she and the rest of her family have remained relatively quiet on social media. 

Disick, however, did Instagram a picture of the card sent by Khloe Kardashian's on-again boyfriend French Montana, in which the rapper wrote, "Congradulations on Baby #3 I wish I could have named him 'Haann' or 'Daddy' I wish you all the blessing in the world!"