Julianna Rose Mauriello is an American actress who played Stephanie in seasons 1-2, except "Pixelspix" where Stephanie only appears in reused clips. She also appeared in the LazyTown: Action Time! spin-off.
When the show was revived for a third season, Julianna was replaced by Chloe Lang, as she outgrew the role.
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Nick Jr video with Julianna Rose Mauriello - LazyTown - bing bang dance