Kim Kardashian and Kanye West's surrogate in labor as baby number four is on the way

Her sister Kourtney Kardashian broke the news during an appearance on The Ellen DeGeneres Show on Thursday, as she revealed the power couple were currently at the hospital and awaiting the birth of their fourth child, a son, via surrogate. 

As the 38-year-old reality star was also set to appear on the show, however Kourtney revealed the reason for her absence - much to the shock of both the audience and their mother Kris Jenner, who was left bewildered.  

It remains unclear if the 41-year-old rapper and 38-year-old reality star will be in the delivery room though Kim was during the birth of daughter Chicago. 

Kim was spotted out on Thursday while grabbing a milkshake in Los Angeles, however it is unclear if she knew at that point if the labour process had began. 

Kim may not have been present but her three kids daughter North, five, son Saint, three, and daughter Chicago, 15 months made a surprise appearance with three more of their cousins. 

Ellen asked about why the middle Kardashian sister was absent and Kourtney, 40, replied: 'So, my mom doesn't even know this but Kim's surrogate went into labor so she's at the hospital. 

Kris, 63, appeared to be blindsided by the news as her mouth dropped and she said: 'What are we doing here? Come on, Ellen! Fire up the car.'

DailyMail.com has reached out to Kim and Kanye's representatives for comment. 

Last month, Kim hosted a wellness-themed baby shower in which the focus was on CBD products, meditation and advice from experts in the field who detailed the properties and benefits of CBD, which is short for cannabidiol and is the chemical extracted from the cannabis plant.

She told her guests at the bash: 'So, because I'm freaking out and the baby's coming in, like, two weeks, I thought what better way to celebrate than to have a little CBD...

'And we're gonna do a sound bath because I can't meditate. It'll only be 10 minutes, but I thought it would be just cool for us to do - to zen out on a Saturday.' 

Back in January, Kim confirmed that they were expecting their fourth child during an appearance on Watch What Happens Live.

Though she also confessed to spilling the beans when she had too much to drink at their star-studded Christmas Eve party.

She told Andy Cohen: 'I got drunk at our Christmas Eve party and told some people. I can't remember who I told because I never get drunk.'

Kim gave birth naturally to daughter North, five, and son Saint, three, and the couple's third child Chicago, 15 months, was born via surrogate in January 2018.

She battled with life-threatening condition placenta accreta during her two pregnancies and has been warned by her doctor to not carry her own baby again.

The condition occurs when all or part of the placenta remains attached to the uterine wall after childbirth.