It's Rachael's first royal mystery taster -- Dame Julie Andrews! From the title role in Mary Poppins to the voice of Queen Lillian in Shrek the Third, Rachael asks Julie what it feels like to be such a great inspiration to generations of people. "It feels a little awesome," she admits. "I think I'm the luckiest lady in the world."

One person who has taken inspiration from Julie (and given some back) over the years is her daughter, Emma Walton Hamilton. In fact, the two women talk about the special bond between mothers and daughters in their latest book, Thanks to You: Wisdom from Mother & Child. Julie explains that this isn't their first co-authoring venture together. "We began about eight years ago and we've been working away ever since. And we love it!"

Emma tells Rachael what it was like having Mary Poppins as a mom, and Julie explains that when it comes to baking, she and Rachael have something in common: it's not their cup of tea!