Kourtney Kardashian has revealed the name she has given her baby son – and shared the first picture of the newborn.

The US reality TV star and her husband Scott Disick welcomed their new arrival a few days ago and have now announced that he will be named Reign Aston Disick.

Kourtney also posted a picture on Instagram of a tiny baby’s hand in an adult’s hand, and told fans she was “madly in love” with her new son.

Kourtney gave birth to Reign on December 14 – her son Mason’s fifth birthday – and a source told E! News the family were “freaking out with joy” at the coincidence.

The couple also have a two-year-old daughter, Penelope.

A picture of Kourtney Kardashian and Scott Disick at a showbiz party
Kourtney Kardashian and Scott Disick have welcomed their third child together (Scott Roth/Invision/Press Association Images)