As the couple adapt to their new role as parents they will no doubt take strength from their solid relationship that was ten years in the making.
Anyone who has seen Kim's glowing smile and easy body language around boyfriend Kanye West knows that something sets this romance apart from the reality queen's past loves.
Friends for many years, the couple begun dating in April 2012 and quickly became inseparable. They practically took up residence at Paris fashion week. She gave him a Lamborghini for his birthday. He responded by laying on a surprise trip to Italy for hers.
CLICK ON PHOTOS FOR THE FULL STORY ON THE COUPLE'S ROMANCE
No wonder Kim seemed to be floating on her Louboutins. As for Kanye, a phenomenally successful rapper with a reputation as a prickly character, he became a huge softie around his new girl. By December, the lovers had announced they were expecting their first child.
With his usual showmanship, the hip hop star broke the happy news to a 5,000-strong audience at a New Year's Eve concert, telling them to "make some noise" for his "baby mama".
He drove the point home by singing: "Now she's having my baby."
Her family were euphoric, with matriarch Kris Jenner firing off a tweet that read: "I'm a happy girl! Wowza! Oh BABY BABY BABY!"
Kim's sisters Kendall and Kylie from her mother's second marriage to Bruce Jenner posted: "Who's excited about the KIMYE babbyyy?!" and "Congrats to the beautiful couple. I love you guys."
So why, when the duo seem so perfect for each other, did it take so long? And what does the relationship mean to Kim?
Click on the photos to read our special report on the romance everyone is talking about.