The 30-year-old actress - best known for her role as Lyla Garry in sports TV series `Friday Night Lights` - topped the list which will be revealed in the US publication`s forthcoming November issue, and admitted she feels more self-confident than ever.
Discussing turning 30, she said: "It is a big one and I love it. I think it`s the most exciting birthday I`ve ever had. I`m so excited to be a woman. Done with the 20s.
"I`m confident - confident in my skin, and I`m cool with my flaws and all that stuff. It just feels nice to be at peace with yourself. I think my 30th birthday gave me permission to have all that. The 20s were a pain in the a*s - figuring it all out. What am I doing? Where do I go?"
However, the Los Angeles-born beauty - who is currently dating football star Derek Jeter - admits her new found confidence does not mean she has any more direction in her life.
Asked what she had planned by the magazine, she said: "I don`t know. And I`m glad I don`t know!"