Her brother Rob is dad to Dream Kardashian, 14 months.
Sister Khloe Kardashian is currently seven-months pregnant with her first child - reportedly a boy - with her boyfriend of one year, Tristan Thompson.
Kylie "talks to Khloe about being pregnant," the magazine's source says, adding that she plans on going to her sister's baby shower.
Earlier this month, the reclusive reality star was spotted getting a large crib delivered to her home.
People's sources says that the makeup entrepreneur "hired a company to baby-proof her house," adding that it's nearly done.
Kylie, who has just weeks to go in her pregnancy, "is anxious about the birth, but excited to meet her baby," People notes.
The Kylie Cosmetics founder is "very happy" and "all about baby" the magazine reports, adding that her daughter's nursery is ready.
While she is anxious about being a mother, she is "never alone," sleeping at her mum Kris' house and spending time with her best friend Jordyn Woods.
Kylie was seen last week - months after her last sighting - at a construction site in Hidden Hills, California.
She hid her baby bump with an oversized black T-shirt and matching sweats while walking besides mom Kris and Jordyn.
News broke of Kylie's pregnancy in the fall; since then the star has rarely been seen in public.
Kylie and Travis, 25, went public with their romance in April at the Coachella Music Festival, after she finally split with on-off boyfriend Tyga.