Heigl and Kelley share adopted daughters Naleigh, 8, and Adalaide, 5, and son Joshua, who the actress gave birth to four months ago.
"I have this philosophy that once you have more than one, whether it'd be a dog or a horse or a child, it's all the same," Heigl told E! News. "So I'm kind of like, 'Let's have four or five' and Josh is tapping out."
The actress and her family live on a ranch in Utah with several pets, including dogs. On Easter Sunday, Heigl shared on Instagram a photo of the group standing near their horse Bellaco.
Heigl said their daughters are "great" with their son.
"Adalaide has become such a little Mommy," she said. "She's carrying around her baby doll, she's changing her baby doll's diaper, she's talking about how much work her baby doll is, how much pressure it is to raise her baby doll right. They're fawning all over him. The kid's a really jolly little guy and my mother keeps saying, 'Why wouldn't he be? He eats all day, he sleeps all night—which is a total blessing—and he's fawned on over by women all day, every day."
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