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“Robbie and I couldn’t be more thrilled to introduce the world to Hattie Harmony. Inspired by the picture books we adored as kids, we hope that Hattie will become a friend and a welcomed reminder to be kind to yourself and to each other,” she told PEOPLE.  “We couldn’t have brought Hattie’s world to life without Marissa Valdez’s imaginative illustrations. In the words of Hattie Harmony… ‘Worry, Worry, Go Away… There’s No Time For You Today.’”

Olsen and Arnett added: “When we sat down to write Hattie Harmony, our goal was to create a relatable character who made talking about complicated feelings fun and engaging for kids. We hope Hattie Harmony will become a welcomed reminder that it’s okay to speak up when we need help and to always treat ourselves and others with kindness.”

Hattie Harmony: Worry Detective is an adorable tale written by Olsen and Arnett that follows a little detective who always loves helping her friends calm down. Hattie is so nervous about her first day of school, but she’s working to find the perfect tools to soothe her anxiety. This heartwarming read is all about starting healthy wellness practices as early as possible, with self-care, self-love, and soothing your kids’ everyday anxieties.

Olsen and Arnett have been together since 2016, marrying in a private ceremony in June 2021 after nearly two years of being engaged.