Fifi Hart (Sophia Elizabeth Hart) is the child actress who portrays Sybbie Branson in the fifth and sixth seasons of the TV - series of Downton Abbey. Her elder sister Mimi Hart is an actress as well.
― Anonymous User 7/29/2018
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Fifi has always been a stereotypical French-sounding name, one of the most famous "Fifis" I know is Fifi LaFume, the young female skunk from Tiny Toon Adventures.