Jennifer L. Siebel Newsom (born 19 June 1974) is an American actress. She has appeared in several TV shows as guest star and has roles in several upcoming movies that include April Fool's Day. Siebel has an undergraduate and a business degree from Stanford University. She has worked for environmental group Conservation International. Her father Ken is an investment manager and her mother Judy co-founded the Bay Area Discovery Museum in Sausalito. On July 26, 2008, she became the first lady of San Francisco by marrying the city's mayor Gavin Newsom.