Actress Katherine Heigl and Grammy Award-winning singer Rihanna are featured on AskMen’s 2008 list of the Top 99 Most Desirable Women.

Katherine Heigl has been named the World’s Most Desirable Woman in a new poll from AskMen.com.

Over 5 million votes were cast to determine who would steal the top spot on AskMen’s annual ranking of the Top 99 Most Desirable Women. Readers were asked to identify women from the worlds of sports, fashion, and entertainment who best represented the qualities of their “alpha-woman.”

AskMen’s Top 10 Most Desirable Women are:

1. Katherine Heigl

2. Alessandra Ambrosio

3. Kate Beckinsale

4. Eva Mendes

5. Jessica Alba

6. Scarlett Johansson

7. Jessica Biel

8. Rihanna

9. Marisa Miller

10. Adriana Lima