The reality TV star, 38, shared the happy news about their baby boy's birth with fans on Friday morning. The couple is already parents to daughter North, five, son Saint, three, and daughter Chicago, 15 months.

'He's here and he's perfect,' the beauty tweeted. Minutes later she added, 'He's also Chicago's twin lol I'm sure he will change a lot but now he looks just like her.'

The baby was born on Thursday evening and weighed in at 6 lbs, 9 ozs, according to TMZ.

This comes after Kim's sister Kourtney, 40, surprised their mother Kris, 63, with the news that the surrogate was in labour with the child during an appearance on The Ellen Show on Thursday, much to the delight of the family matriarch.

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.'

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