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While signing the publication for awaiting fans, the older sister of Hilary Duff wore a white blazer, brown skinnies, and white ankle boots.
In the book, the 28-year-old star shares tons of healthy recipes and some for "cheat days," as well as accompanying each one with a personal story.
Stoked for the positive reception, Haylie tweeted, "What a great release week for the #realgirlskitchen book! Thank you all for so much love & support."