Sheryl Crow and her just-adopted son, Wyatt!

In her first interview and photo shoot as a brand-new mom, the singer coos about spending the past three weeks holed up in her Los Angeles mansion with her just-adopted newborn son, Wyatt. "The day he came home (on April 30), I felt like the whole house had changed. The house felt fuller," Crow tells OK! magazine, on stands Friday. "You just feel like nesting and making sure he's acclimated to the world. It is all so fascinating."

The Missouri native, who went through a closed, out-of-state adoption and had Wyatt within 24 hours of his birth, says her parents and a "wonderful baby nurse" have been in the house to help out.

"My mom would hand him to me and say, 'Here's your mommy.' It was really poignant (and very startling) to hear my mom call me Mommy," Crow says. "It took me a while to get used to it."

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