Once hailed as “Audrey Hepburn with a darker edge,” actress Rose Byrne launched a successful film career in the United States after an auspicious showbiz beginning in television in her native Australia. Her pivotal role as Trojan princess Briseis in the epic “Troy” (2004) marked her first major exposure to American audiences, after which she lent her effusive charm to mainstream successes like “28 Days Later” (2007) and represented a promising new breed of young actor in the youthful thriller “Wicker Park” (2004) and a contemporary take on the life of “Marie Antoinette” (2006). An acclaimed