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Lilly Foster-Lambert is a character on ABC family comedy Step by Step. She is portrayed by twins Lauren Meyering and Kristina Meyering as a baby during seasons 4–5 and as a five year old Emily Mae Young during seasons 6–7.

Lilly is Frank and Carol's biological child, who is introduced in the season four episode "A Foster/Lambert Production". Originally depicted as a baby, Lilly's age is retconned to 5-years-old in the show's sixth season after the character is SORASed. For her age she is very smart and is always asking questions of everyone.