"Right when they got serious, Kourt and Travis decided to put effort into getting pregnant," the source claimed. "It was a no-brainer for both of them because they’ve set their hearts on a big family and agreed there was no point in delaying or waiting to be married first."
Since the Poosh founder is 42, she's open to doing IVF, but the couple are reportedly trying naturally as well. She's previously revealed that she had her eggs frozen, documenting the process on Keeping Up With the Kardashians.
The Blink-182 drummer is already a father himself, sharing son Landon, 18, and daughter Alabama, 16, with ex-wife Shanna Moakler. (He also coparents Moakler's daughter Atiana De La Hoya.)
The insider spilled that Kardashian could actually be pregnant at the moment, but it's "highly unlikely" that she would make a public announcement.
"Their close friends and family are all aware it’s in the works and that it’s just a matter of time before she confirms the news they’re expecting," shared the source. "Both of them are certain it’s the right path."
"Kourtney just melts seeing how great Travis is with his own kids, and he has been a model gentleman with her and Scott's too. They just adore him," the source continued. "It’s going to be a beautiful journey that ends with them blending their families as one and they cannot wait."
The baby talk could play out on The Kardashians, the famous family's new Hulu series that debuts on Thursday, April 14. It's unclear whether or not viewers will get to witness the engagement, though the soon-to-be spouses did share photos of the special moment on social media.