OK! Exclusive Video: Heidi & Spencer Reveal That She Wants As Many Kids As The Duggars: "They're So Lucky!"

By:Haley Longman

Jan. 9 2015, Published 6:05 p.m. ET

The main reason that Heidi Montag and Spencer Pratt joined Marriage Boot Camp: Reality Stars was because Heidi is ready for kids but Spencer isn't. And while Spencer has sort of gotten on board with the idea of becoming a father since boot camp, Heidi gives her husband the shock of his life in our exclusive interview, above, where she tells him she wants at least four kids!

WATCH: Heidi & Spencer Pack On The PDA At The Marriage Boot Camp Premiere

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Spencer claims that she's never discussed wanting more than two, but now four? Spencer then replies, "Who are you, a Duggar now?" "They're so lucky," Heidi says, referring to the reality TV family of 19 Kids & Counting. "Lots of kids! So cute! Our kids should be having kids while we have kids! That's a good thing. I'm fertile!"

But baby plans aside, the couple known as Speidi also told us why they wished they lived in the same house as their Hills co-stars when the show was filming, and how their relationships are now with their sisters, who they say they got paid to argue with on The Hills. They also talk about their experience working with Patti Stanger on Millionaire Matchmaker to set up Spencer's sister, Stephanie, and what Patti told them about their own relationship!