Melissa Sagemiller is an American television and film actress. She is known for her performances in films Get Over It , Soul Survivors , Sorority Boys , The Clearing , The Guardian and Mr. Woodcock . Sagemiller also starred in television dramas Sleeper Cell , and Raising the Bar , and from 2010 to 2011 had the recurring role as A.D.A. Gillian Hardwicke in the Law & Order: Special Victims Unit.