The reality couple will confront their differences about children in the new series of Marriage Boot Camp, a reality show that airs on WE tv in America.
In a new trailer for the show, Heidi says: "We've been married for six years. We are in boot camp to get over our regrets about the past and fear about the future. I'm ready to have children and Spencer is acting like a child and not ready for one."
Spencer responds: "I'm baby blocking."
Marriage Boot Camp rounds up famous couples and asks them to live together in a mansion as they try to confront the issues that are threatening to hurt their relationships.
Babies is clearly an issue for Heidi and Spencer, who are assigned a room in the mansion filled with baby goodies including a cot and toys.
Heidi is thrilled by it… Spencer not so much.
"I was overwhelmed with excitement when we saw the baby room," gushed Heidi.
"My heart sank," responded Spencer.
"My heart was overjoyed," said Heidi.
Meanwhile, in other Hills baby news, Heidi's sister Holly Montag announced over Christmas that she is expecting her first child with husband Richie Wilson.
A thrilled Heidi said: "Congratulations to @hollymontag !! Yesterday was the most beautiful wedding I could imagine! Wishing you all the blessings and joy! Love you!"
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