Scott Disick and Kourtney Kardashian in 2012. Picture: Bang Showbiz

Scott Disick wants another baby with Kourtney Kardashian, according to Kim Kardashian West, who claims Scott text her the confession.

The 35-year-old reality star already has Mason, eight, Penelope, six, and Reign, three, with his former partner, and although he's now romancing 20-year-old Sofia Richie, it has been claimed by Kourtney's sister Kim Kardashian West that he told her he wants to have one more tot with his former flame.

Speaking in a promotional clip for Sunday's episode of 'Keeping Up with the Kardashians', 37-year-old Kim told family friend Larsa Pippen: "So Scott just texts me that he wants to have another baby with Kourtney. I think he just wants one more, and she wants one more."

To which Larsa agreed, and added: "She definitely wants more kids. If they both want to have more kids, why not have them together? Their kids are gorgeous."

At the time of filming, 39-year-old Kourtney was in a relationship with Younes Bendjima - whom she split with over the summer - and although both parties were spoken for, Kim was convinced a fourth child could still be a possibility for the former couple.

She said: "I mean, it's like, Scott has a girlfriend, Kourtney has a boyfriend - we get it. They don't even have to have sex. It could be IVF.

"I have to tell the rest of the family to be like, 'Guys, should we encourage this?' How cute will that be? They have to have another baby!"

And Kim - who has North, five, Saint, two, and Chicago, eight months, with her husband Kanye West - can't help but admit she's hoping her sister and Scott get back together one day.

She added: "If she's going to have another baby, why don't they just have one together even if they're not together? I think that I do hold onto this hope of Kourtney and Scott, just because I'm so used to them being together."