Nicole Leach portrayed Jessi Ramsey in the 1990 television series based on the books. She was born on May 10, 1979 in Montclair, New Jersey. She now goes by the name Nicolle Rochelle and is still active in theater.
The Baby-Sitters Club imdb page: http://www.imdb.com/title/tt0125602/combined
Nicolle Rochelle's imdb page: http://www.imdb.com/name/nm0494845/