Simmons wanted to become an actress at the age of three, but waited until she turned five to pursue a career. She started modeling and appeared in commercials. Simmons breakthrough was the notable role of Laurie Ann Winterbarger, first victim of Pennywise the Clown (Tim Curry), in Stephen King's It. She went on to star in Bingo and appeared in several TV shows as a child star.
Simmons' later appeared in guest appearances in TV shows before playing recurring roles in the MTV show MTV's Now What? and Crystal in Edgemont for 11 episodes. Simmons went on to star in the TV movies Carrie, Snakehead Terror and Monster Island, which co-starred Carmen Electra.
In 2005, Simmons' was cast in the comedy The Long Weekend before starring in the 2006 horror Final Destination 3, possibly her best known role to date. In the same year, Simmons' also starred in Dr. Dolittle 3 and had a cameo role in John Tucker Must Die. Simmons won the role of the recurring character Hillary in the ABC Family show Kyle XY. She portrayed Hillary for three years until the show was canceled in 2009. Simmons' also had a role in Good Luck Chuck and portrayed Lindsay Lohan in the TV movie Paparazzi Princess: The Paris Hilton Story. Due to Simmons' many roles in the horror genre, she is considered a modern day scream queen.
In 2010, Simmons had a cameo role as a lotus eater in Percy Jackson & the Olympians: The Lightning Thief and starred in the critically well received comedy-horror movie Tucker & Dale vs Evil. Simmons is set to appear in the upcoming Dark Star Hollow directed by John Carl Buechler. Simmons also landed a role in the upcoming show Highland Springs..
|1990||Deep Sleep||Young Shelly McBride||Uncredited|
|2005||Chupacabra: Dark Seas||Jenny||Direct-to-DVD|
|2006||Final Destination 3||Ashley Freund|
|2006||Dr. Dolittle 3||Vivica||Direct-to-DVD|
|2006||John Tucker Must Die||Crying Waitress||Cameo|
|2007||Wind Chill||Blonde Girl|
|2007||Good Luck Chuck||Carol|
|2008||Christmas Cottage||Miss Placerville||Direct-to-DVD|
|2010||Tucker & Dale vs Evil||Chloe|
|2010||Percy Jackson & the Olympians: The Lightning Thief||Lotus Land Waitress||Cameo|
|2011||Dark Star Hollow||Tracy Hall||Rumored|
|1991||Scene of the Crime||Lori||Episode: "Show and Tell"|
|1991||Captain Zed and the Zee Zone||Additional Voices||TV series|
|1993||Template:Sortname||Additional Voices||TV series|
|1993||Jack's Place||Young Girl (uncredited)||Episode: "Faithful Henry"|
|2000||2gether: The Series||Hot Teenage Girl||Episode: "Dead"|
|2001||Special Unit 2||Naughty Girl #2||Episode: "The Eve"|
|2001–2002||MTV's Now What?||Cindy||4 episodes|
|2002||Smallville||Felice Chandler||Episode: "Drone"|
|2004||Wonderfalls||Gretchen Speck-Horowitz||Episode: "Wax Lion"|
Episode: "Pink Flamingos"
|2005||Zixx: Level Two||Louise||Episode: "Trust No One"|
Episode: "Now You See Him"
|2005||Template:Sortname||The Devil / Spokesmodel||Episode: "The UFOlogist"|
|2005||Supernatural||Jill||Episode: "Bloody Mary"|
|2005||Stargate: Atlantis||Mara||Episode: "The Tower"|
|2006||Men in Trees||Tiffanii||Episode: "For What It's Worth"|
Episode: "Sink or Swim"
|2006–2009||Kyle XY||Hillary||24 episodes|
|2007||Psych||Bianca||Episode: "Scary Sherry: Bianca's Toast"|
|2007||About a Girl||Stacy||3 episodes|
|2007||Whistler||Model||Episode: "The Rules of Attachment: Part 1"|
Episode: "Last Run"
|2010||Always a Bridesmaid||Savannah Springs||4 episodes|
|2011||Highland Springs||Alicia Lowe|
|1990||Stephen King's It||Laurie Ann Winterbarger||TV movie|
|1992||Bitsy Bears||Whirly / Tickles (voice)||TV movie|
|2000||Ratz||Jennifer Martin||TV movie|
|2002||Carrie||Helen Shyres||TV movie|
|2004||Snakehead Terror||Amber James||TV movie|
|2004||Monster Island||Jen||TV movie|
|2008||Ogre||Hope Henry||TV movie|
|2008||Paparazzi Princess: The Paris Hilton Story||Lindsay Lohan||TV movie|
|2009||Malibu Shark Attack||Jenny||TV movie|
|2009||Sorority Wars||Casadee||TV movie|
|2009||Ice Twisters||Nora Elman||TV movie|
|2010||Seduced by Lies||Tia||TV movie|
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