Cassia Riley (born October 27, 1980, in Los Angeles, California) is a model and was the Penthouse Pet of the Month for April 2005 and was Pet of the Year Runner-Up 2006. She got into modeling after a friend introduced her to someone in the business. Riley made her first appearance on the Howard Stern radio show in June 2005, her second appearance in February 2006, and her third appearance on December 11, 2006.