![Famous siblings ... The new bub joins a very public family.](http://resources2.news.com.au/images/2014/12/15/1227156/172254-f44a904a-83db-11e4-b7a3-5366c32c384a.jpg)
Famous siblings ... The new bub joins a very public family. Source: Supplied
ELDEST member of the Kardashian clan, Kourtney, has given birth to her third child with long-time partner Scott Disick.
The pair welcomed a son into the world on Sunday (US time), which also happens to be the birthday of their first child, five-year-old Mason.
Kardashian and Disick also have a daughter, Penelope, aged two.
![Parents again ... The new bub was born on the same day as his big brother, Mason.](http://resources3.news.com.au/images/2014/12/15/1227156/169435-e6fe88ce-83db-11e4-b7a3-5366c32c384a.jpg)
Parents again ... The new bub was born on the same day as his big brother, Mason. Source: Getty Images
![Growing brood ... Kourtney Kardashian takes her kids Penelope and Mason to a mall in Topa](http://resources2.news.com.au/images/2014/12/15/1227156/170298-ec6d8260-83db-11e4-b7a3-5366c32c384a.jpg)
Growing brood ... Kourtney Kardashian takes her kids Penelope and Mason to a mall in Topanga Canyon. Source: Splash News Australia
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The rest of the famous family is reportedly “freaking out with joyâ€, a source told E! News.
“What an amazing coincidence,†the source said.
On Saturday, Kardashian hinted at the bundle-of-joy’s arrival, posting an Instagram picture of a baby’s cot. And mum Kris Jenner told E! last Wednesday that the bub was only days away.
There has been no official word from the Kardashian camp yet, but Us Weekly broke the news this morning.