1. 27 Dresses (2008) (filming) .... Jane
   
   
2. "Grey's Anatomy" .... Dr. Isobel 'Izzie' Stevens (61episodes, 2005-2007)
   - Didn't We Almost Have It All? (2007) TVEpisode .... Dr. Isobel 'Izzie' Stevens
   - Testing 1-2-3 (2007) TVEpisode .... Dr. Isobel 'Izzie' Stevens
   - The Other Side of This Life: Part 1 (2007) TVEpisode .... Dr. Isobel 'Izzie' Stevens
   - The Other Side of This Life: Part 2 (2007) TVEpisode .... Dr. Isobel 'Izzie' Stevens
   - Desire (2007) TVEpisode .... Dr. Isobel 'Izzie' Stevens
   (56 more)
3. Knocked Up (2006) .... Alison Scott
4. Caffeine (2006/I) .... Laura
5. Zyzzyx Rd. (2006) .... Marissa
6. The Ringer (2005) .... Lynn Sheridan
7. Side Effects (2005/I) .... Karly Hert
8. Romy and Michele: In the Beginning (2005) (TV) .... Romy White
9. Love's Enduring Promise (2004) (TV) .... Marty Davis
10. Wuthering Heights (2003) (TV) (as Katherine M. Heigl) .... Isabel Linton
11. Critical Assembly (2003) (TV) .... Aizy
    ... aka Ground Zero (USA: alternative title)
12. Descendant (2003) .... Ann Hedgerow/Emily Hedgerow
    ... aka Descendent, Descendent (USA)
13. Evil Never Dies (2003) (TV) .... Eve
14. Love Comes Softly (2003) (TV) .... Marty Claridge
15. Vegas Dick (2003) (TV)
16. "The Twilight Zone" .... Andrea Collins (1episode, 2002)
    - Cradle of Darkness (2002) TVEpisode .... Andrea Collins
17. "Roswell" .... Isabel Evans/ ... (61episodes, 1999-2002)
    ... aka Roswell High (UK) (USA: working title)
    - Graduation (2002) TVEpisode .... Isabel Evans
    - Four Aliens and a Baby (2002) TVEpisode .... Isabel Evans
    - Crash (2002) TVEpisode .... Isabel Evans
    - Who Died and Made You King? (2002) TVEpisode .... Isabel Evans
    - Chant Down Babylon (2002) TVEpisode .... Isabel Evans
    (56 more)
18. Valentine (2001) .... Shelley Fisher
19. 100 Girls (2000) .... Arlene
    
    
20. The Tempest (1998) (TV) .... Miranda Prosper
21. Bride of Chucky (1998) .... Jade
22. "Law & Order" .... Juror (1episode, 1998)
    ... aka Law & Order Prime (USA: informal title)
    - Castoff (1998) TVEpisode .... Juror
23. Bug Buster (1998) .... Shannon Griffin
    ... aka Some Things Never Die (UK: video title)
24. Stand-ins (1997) .... Taffy-Rita Hayworth's Stand-in
25. Prince Valiant (1997) .... Princess Ilene
    ... aka Prinz Eisenherz (Germany)
26. Wish Upon a Star (1996) .... Alexia Wheaton
27. Under Siege 2: Dark Territory (1995) .... Sarah Ryback
    ... aka Under Siege 2
28. My Father the Hero (1994) .... Nicole
    ... aka My father, ce héros (France)
29. King of the Hill (1993) .... Christina Sebastian
30. That Night (1992) .... Kathryn
    ... aka One Hot Summer

forrás: http://www.imdb.com/name/nm0001337/