It's been rumoured for some time... and now Kim Kardashian has confirmed that she and Kanye ARE having a third child.

The reality TV star took to Twitter to confirm the happy news - telling her 56 million followers that baba No.3 is en route. In the tweet, the 36-year-old shares a clip from a forthcoming episode of Keeping Up With The Kardashians. Kim can be seen Facetiming her younger sister, Khloe. "What happens every time I say, 'Guess what?'" Ms Kardashian asks. "Pregnant, or the person’s pregnant," Khloé responds. "We’re having a baby!" Kim then responds excitedly. https://twitter.com/KimKardashian/status/913482981422931968 However, in the episode promo there is no mention of Khloé's or Kylie's pregnancies. Kim and her husband of three years, Kanye West, already have two children: daughter North, aged four, and son Saint, 22 months. Following two risky pregnancies fraught with health issues, Kim was advised by her doctors not to conceive again. The couple hired a surrogate in June. "The entire family is over the moon," a source told PEOPLE at the time. "Kim had been looking for a surrogate for months until recently when she found the perfect candidate." Kylie, 20, is around five months' pregnant with her boyfriend, Travis Scott. Khloé, 33, is seemingly three months' pregnant with partner, basketball player boyfriend Tristan Thompson. Congrats, guys!