Kim, Kanye West's surrogate pregnant with boy

Reality TV star Kim Kardashian and rapper Kanye West are expecting their fourth child -- a boy -- via surrogate.

Multiple sources have confirmed in the new issue of Us Weekly magazine.

In August, the magazine reported that the couple, who used a surrogate for their third child, 11-month-old Chicago, had one embryo left, a male.

Now he is due to arrive "in very early May", said a source.

In addition to Chicago, the couple are also parents to North, 5, and Saint, 3.

Another source said Kim, 38, "always wanted four kids".