"It was in my heart to have a boy. I thought Spencer really used to want a boy, and then a few months ago we had a conversation where he said, 'Let's just make sure it's healthy. Boy or girl, I don't care,'" Heidi gushed to the magazine at the time.
"I hope to have a little girl one day, but for my first child, I really wanted a son. I'm hoping to God that we don't just have one, but if we do, I wanted a son. I thought it'd be a more natural bond for Spencer since he and his dad are so close."
Prior to the child's due date, the reality TV stars enjoyed a relaxing and romantic babymoon in Hawaii.
Heidi shared updates throughout her pregnancy of her growing baby bump on social media. Four days before Gunner was born, Heidi posted a photo on Instagram of the couple wearing crowns while sitting on a picnic blanket surrounded by their four small dogs.
"Family portrait. Ready for our son!" Heidi captioned the image, adding the following hashtag: "9 months pregnant."
Heidi and Spencer got engaged in May 2007 and wed in April 2009, when Heidi took Spencer's last name.
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In addition to The Hills, Heidi and Spencer have also appeared on Celebrity Big Brother in the U.K., Celebrity Wife Swap, Marriage Boot Camp, and I'm a Celebrity... Get Me Out of Here!.