Hewitt's first movie role was in the independent movie "Munchie" (1992). Hewitt became very well known after a lead role in the horror movie "I Know What You Did Last Summer" (1997). She also played in the sequel "I Still Know What You Did Last Summer" (1998). Other movie roles included the high school comedy "Can't Hardly Wait" (1998) and the romantic comedy "Heartbreakers" (2001). In 2002, she worked with Jackie Chan in the action comedy "The Tuxedo".