The 34-year-old reality TV star was seen leaving a restaurant looking carefree and casual in jeans and a shirt with her long-term partner Scott Disick and their one-year-old daughter Penelope.
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The eldest of the Kardashian sisters is said to have confirmed the happy news to her close friends and family.
Sources close to the star have revealed that Kourtney and Scott are extremely excited and have only decided to tell close friends and family.
"Kourtney has that kind of glow she had with Mason and Penelope," added the source. "They wanted to have one right after Penelope."
Speculation began when Kourtney avoided drinking alcohol and eating raw fish during a recent trip to Miami.
Kourtney and Scott are already parents to Mason and Penelope.
It is no secret that Kourtney would like a recreate the big family atmosphere she enjoyed in her childhood with sisters Kim and Khloe, brother Rob, two half-sisters Kendall and Kylie and her four step-siblings Brody, Brandon, Burt and Kasey.
Kourtney posted a picture on her Instagram account on Thursday of her posing with her younger sister Khloe and two women from the funny trio Golden Sisters
Speaking last year, Kourtney said "it would be wonderful" if her sisters Khloe and Kim had children - just months before Kim announced that she was expecting a child with Kanye West.
Unlike Kourtney, younger sister Kim hasn’t been seen out in public since the birth of her baby girl, North, on 15 June.
Rumours have circulated that Kim will appear on mother, Kris Jenner’s talk-show to show off her post-pregnancy figure and introduce baby North to the world.
Kris appeared on the Today Show on 8 July and was asked to deny that the first pictures of baby North would be revealed on the show.
"I won’t tell you it won't happen," Kris answered with a smile.
"Give you a little something to think about. You never know who is going to show up," she replied.