Kim Kardashian, Kanye West welcome fourth child

Reality star Kim Kardashian and her rapper husband Kanye West have welcomed their fourth child into the world via a surrogate.

Kim Kardashian - who also has North (5), Saint (3) and 15-month-old Chicago - took to Twitter to report that her newborn is the "most calm and chill" of all her children.

She wrote: "I was freaking out for nothing because he is the most calm and chill of all of my babies so far and everyone loves him so much. (sic)"

Meanwhile, a source recently claimed that Kim and Kanye, 41, already have a "name in mind" for their newborn child.

The insider said: "They have had a name in mind, but wanted to meet the baby before they decided."