Tiffani Thiessen. Actress: Alexa & Katie. Tiffani Amber Thiessen was born on January 23, 1974 in Long Beach, California to Robyn Ernest, a homemaker & Frank Thiessen, a park designer. She grew up in Long Beach with her parents and her brothers, professional cyclist Todd (born August 1, 1968) and Schyler (born May 10, 1977). When Tiffani was 8, her uncle, Roger Ernest, suggested that she try acting and modeling....