Pink, 37, and Hart, 41, announced their second child via a sweet Instagram post featuring their five-year-old daughter Willow Sage.
Hart told PEOPLE that their daughter is “over the moon” to welcome her sibling.
“She’s been talking about how she wants a baby sister,” he said. “She built a bicycle for him or her. So we’re going to finish it up after number 2 shows up.”
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