Talk Show Queen, Oprah Winfrey Reveals Her Highest Achievement On 60th Birthday.

Oprah Winfrey has reached another milestone! The TV personality turns the big 6-0 today, and to celebrate, she's recalled some of the biggest moments in her life so far in an open, and very heartfelt, letter to those who have stuck by her through the years.

"I'm turning 60. I'm alive. Healthy. Strong," Winfrey wrote in her O, The Oprah magazine "I'm turning 60, and -- please don't take offense -- I no longer have to be concerned about what anyone thinks of me! (You know, the old Am I doing it right? Am I saying it right? Am I being what or who I'm 'supposed' to be?) I'm turning 60, and I've earned the right to be just as I am. I'm more secure in being myself than I've ever been."

For years, Winfrey has opened her doors to audiences, interviewed famous and otherwise unknown people until The Oprah Winfrey Show's end in 2011, and has continued to connect with people through her OWN Network and magazine. But, as it turns out, she doesn't consider any of these (or even giving a car away to each member in her audience!) as her highest achievement. What is? "Never shutting my heart down," she wrote

"Even in my darkest moments through sexual abuse, a pregnancy at 14, lies and betrayals I remained faithful, hopeful, and open to seeing the best in people, regardless of whether they were showing me their worst," the actress wrote. "I stayed open to believing that no matter how hard the climb, there is always a way to let in a sliver of light to illuminate the path forward."

She continued: "I approach this milestone, the landmark of 60, with humility, supreme thanksgiving, and joy. Knowing for sure grace has brought me safe thus far, and grace will lead me home."