This is undoubtedly iCARLY's most famous and most seen episode in series!!.. The ONE DIRECTION boys guest star... HARRY STYLES here takes center stage (showing this early his talent as "the actor" years before it became a reality) as he gets sick and can't perform, so the 1D boys think of getting a substitute... This episode includes a great singing performance by 1D and all the girls seem to be having a great time working with Harry, Louis, Liam, Niall, and Zayn... A MUST SEE SHOW.
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