The TV star already has three children, Harvey, eight, Junior, five, and three-year-old Princess Tiaamii, from previous relationships and although she was rumoured to be interested in adopting a baby from Leandro`s native Argentina, Katie would prefer to have a child with him.
In an interview with Britain`s OK! magazine, she said: "I`ve adopted an Argentinean man. I wouldn`t adopt an Argentinean baby at this point but I would have a baby with an Argentinean man when the time is right."
Katie, 33, compares her relationship with 25-year-old Leandro - who has a daughter, three-year-old Sofia, from a previous relationship - to that with her ex-husband Peter Andre and is thrilled with how close the model has become to her eldest son, Harvey, whose father is retired soccer player Dwight Yorke.
She said: "With Leo it`s very similar to when I met Pete. With both of them the circumstances were against us - everything that shouldn`t be, was.
"Leo is great though. He really takes time with Harvey and Harvey will come to him now. Harvey gets a feel for people in his own way."