* Kellan Lutz as Todd
* Lauren Conrad as Kelly
* Molly Sims as Amber
* Riki Lindhome as Natalie
* Britt Robertson as Jenna
* Stephanie Pratt as Samantha
* Josh Henderson as Nick
The film also featured several supporting roles and cameos, including:
* Adam Brody as Sean
* Ryan Merriman as Blake
* Ashley Tisdale as herself
* Paris Hilton as herself
This is just a partial list, as there are many other actors and actresses who appeared in the film. You can find a more complete list on websites like IMDb.