By JONATHAN DURBINBeth PerryDavid ChiuVICK BOUGHTON and MICHELLE GREEN
Updated July 14, 2008 12:00 PM
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Asked to write a children’s book while pregnant with second daughter, Grier, now 2 (big sis Rowan is 5), Shields, 43, found she had plenty of material.

WHAT’S WELCOME TO YOUR WORLD, BABY ABOUT?
The birth of a new sibling. My daughter Rowan says so many humorous one-liners that I write down, she basically wrote the book. I gave the big sister her voice—a perky, kind of brassy 5-year-old.

HOW DID ROWAN FEEL ABOUT GRIER’S ARRIVAL?
I involved her, so she was excited.

DO THEY GET ALONG?
Sometimes you have to run in and break it up, but it’s amazing how innate their love is.

IS YOUR HOUSE AS GIRLY AS THE ILLUSTRATIONS?
We have so much princess paraphernalia that it would blow your mind.