"I'm definitely going to include them," she told PEOPLE Saturday at the unveiling of Diane von Furstenberg's new GapKids and babyGap collections in Los Angeles. "I know people say it's all going to change, but I don't want it to change – I want to include them."
Though Sims anticipates her furry brood (which also includes husband Scott Stuber's white Lab) will be jealous at first, she's looking forward to the baby babble that's on the horizon.
"I'm so glad the baby's going to be able to talk back and have a conversation [with them]," she said. "Scott thinks I'm crazy."
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