Per IMDB :

Diane Franklin is an iconic 80s American film actress, known for her dark curly hair, and dialects. Beginning her acting career at the age of ten, Diane started with modeling, theater, commercials, and soap opera work. She then won the lead role of the dream girl, Karen, in cult classic THE LAST AMERICAN VIRGIN (1982) and soon after played the daughter, Patricia Montelli in AMITYVILLE II: THE POSSESSION. Her break-out film role was the spirited French-exchange student, Monique Junot, from the off-beat comedy BETTER OFF DEAD. And her most notable commercial success was playing the medieval Princess-babe, Joanna, from 1980s iconic comedy, BILL & TED'S EXCELLENT ADVENTURE. Diane sang the NATIONAL ANTHEM at Dodger Stadium in 2004, and wrote two autobiographies about her career.