Maria Shriver has known since she was a student that she wanted to be a journalist, and yet years after she became an accomplished journalist and then first lady of California, she had a bit of an identity crisis as she prepared to give a high school graduation speech. "I was trying to figure out who the students wanted me to be because I had left my job and I was in transition," Maria tells Rachael. "It kind of evolved with me realizing that I was constantly trying to figure out who people wanted me to be and that I should actually stop that -- that I was 50 and should stop it and actually look within and figure out who I wanted to be at this age."

After she wrote the speech, she realized that others would benefit from her words of wisdom, so she turned the commencement address into her latest book Just Who Will You Be? and it's now a best seller. "This book really had me evaluate: What is success? What is true power about? True power comes from knowing who you are," Maria says. "What the world needs are more people doing what brings them joy." (Click here to read an excerpt from the book).

She's also a mother of four with husband and California Gov. Arnold Schwarzenegger, and neither of them is pushing their kids into the political arena. "I'm actually really OK with that because I was raised to believe that if you weren't president, gosh what's wrong with you? You're not achieving!" jokes the niece of President Kennedy and Massachusetts Sen. Edward Kennedy. Instead she told her kids, two of whom have already expressed an interest in working with animals: "I love you for who you are, not for what you're going to achieve."

They're already involved in charitable work, helping to launch her family's new Lovin Scoopful ice cream brand which is raising funds for the Special Olympics.