Life as We Know It (2010) …. Holly Berenson
“Up Close with Carrie Keagan” (1 episode, 2010)
Killers (2010) …. Jen Kornfeldt
The Ugly Truth (2009)
“Grey’s Anatomy” …. Dr. Isobel ‘Izzie’ Stevens
27 Dresses (2008) …. Jane
Knocked Up (2007) …. Alison Scott
Caffeine (2006/I) …. Laura
Zyzzyx Rd. (2006) …. Marissa
The Ringer (2005) …. Lynn Sheridan
Side Effects (2005/I) …. Karly Hert
Romy and Michele: In the Beginning (2005) (TV) …. Romy White
Love’s Enduring Promise (2004) (TV) …. Marty Davis
Wuthering Heights (2003) (TV) (as Katherine M. Heigl) …. Isabel Linton
Critical Assembly (2003) (TV) …. Aizy Hayward
Descendant (2003) …. Ann Hedgerow/Emily Hedgerow
Evil Never Dies (2003) (TV) …. Eve
Love Comes Softly (2003) (TV) …. Marty Claridge
Vegas Dick (2003) (TV)
“The Twilight Zone” – Cradle of Darkness (2002) TV episode …. Andrea Collins
“Roswell” …. Isabel Evans…. (61 episodes, 1999-2002)
Valentine (2001) …. Shelley Fisher
100 Girls (2000) …. Arlene
The Tempest (1998) (TV) …. Miranda Prosper
Bride of Chucky (1998) …. Jade
“Law & Order” – Castoff (1998) TV episode …. Juror
Bug Buster (1998) …. Shannon Griffin
Stand-ins (1997) …. Taffy-Rita Hayworth’s Stand-in
Prince Valiant (1997) …. Princess Ilene
Wish Upon a Star (1996) …. Alexia Wheaton
Under Siege 2: Dark Territory (1995) …. Sarah Ryback
My Father the Hero (1994) …. Nicole
King of the Hill (1993) …. Christina Sebastian
That Night (1992) …. Kathryn