Kyle, 50, and Mauricio, 48, were in Hawaii for Camille Grammer's wedding and sitting at lunch when the businessman revealed he wants a fifth child.
"What am I going to do with the Umansky name? Should we just have another kid? Just a boy … for the sake of it?" Mauricio asked a stunned Kyle. "Honey are you kidding me?" she replied with a laugh.
The couple are already parents to daughters Alexia, 22, Sophia, 19, and Portia, 11. The Bravo star also has daughter Farrah, 30, from her first marriage to Guraish Aldjufrie.
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The pair married in 1996 and their rock solid relationship has escaped the "reality TV curse" of getting divorced.
"Honestly, you know, there’s a stigma…that all the Housewives get divorced,” Kyle admitted during an interview with E! News in 2013.
She added, "My husband and I have a really strong solid marriage, Lisa Vanderpump and Ken have a very strong, solid marriage, but I think if you have any cracks in your marriage then you really shouldn’t do a reality show. Because it will not survive.”
Do you think Kyle and Mauricio should have another child? Sound off in the comments below!