Di Johnston was born in Hong Kong to two US diplomats. After stints in mainland China and Virginia, she moved to New York where she began her performing career. Within months of arrival, Di began to establish herself as a voice-over actor in NYC. She became the voice of many commercial campaigns, including Lincoln Mercury, Pantene, Lenscrafters, Verizon Wireless, PNC Bank and CMT. In 2006, she was selected as the announcer for the Miss America Pageant.