The stunning actress, who is married to Tom Cruise, has topped a poll conducted by America's OK! magazine to find the most fashionable celebrity.
In recent months, Katie has transformed herself from her tomboy "Dawson's Creek" character Joey Potter into a sleek fashionista who is never uncomfortable on the red carpet.
One OK writer said, "Katie Holmes has matured from teen queen into a pillar of fashion. This year her style was developed and fine-tuned so much so that she came to be viewed in the same realm as legends like Jackie O, helping her cruise beyond the shadow of her husband and into an iconic realm of her own."
America's OK! magazine's Most Stylish Stars of 2007 full list:
1. Katie Holmes
2. Katherine Heigl
3. Gwen Stefani
4. Kate Moss
5. Rihanna
6. Mary-Kate and Ashely Olsen
7. Jennifer Lopez
8. Rachel Bilson
9. Diane Kruger
10. Dita Von Teese
Source: AHN