In 2003 Gertz starred as Brandy, a wanted criminal's girlfriend, in Undercover Christmas, and in 2005 Gertz played the lead role in the TV film Fighting the Odds: The Marilyn Gambrell Story. In 2009–10 she had a recurring role as Marlo Klein, wife of Ari Gold's newest Business partner Andrew Klein, an agent at Miller-Gold Talent Agency, on HBO's Entourage. In 2011, she returned to broadcast television with a guest role in the Modern Family episode "Slow Down Your Neighbors". In 2011, she earned a producers' credit on the Academy Award-nominated film A Better Life which was put in limited release throughout the month of June and early July before arriving on DVD in October.