Sophie Monk Suing Over 2010 Car Accident

Sophie filed the lawsuit in L.A. County Superior Court -- claiming driver Delvinder Sing Bains caused her "severe injuries" when his Ford Explorer collided with the Prius she was riding in.

Sophie was spotted being rolled around in a wheelchair just days afterwards, her foot wrapped in bandages. (She is now walking again.)

Sophie doesn't specify the extent of her injuries in the lawsuit -- but says the accident put her out of work for a while ... and racked up some serious medical bills.