Yvonne Jaqueline Strzechowski was born and raised in Australia. Her parents were Polish immigrants. She attended the Santa Sabina College for her high school education. She then went on to study Performance at the University of Western Sydney's School of Contemporary Arts, graduating in 2003. Shortly afterwards, she landed her first role on television in an episode of Fear Factory (2004). Her next role was also on Australian television, appearing in several episodes of Headland (2005). In 2007, she made her big screen debut in Gone (2006). This performance caught the attention of casting directors in Hollywood. She decided to move from Australia to Los Angeles and, on her third day of arrival, she landed her breakthrough role as "Sarah Walker" in Chuck (2007).