'The happiest years of my life...' These A-Listers all started their careers on Nickelodeon

Some of the world's biggest stars got their start on the small screen of children's TV. From Ariana Grande to Emma Stone, take a look through to see which celebrities appeared on the orange network before hitting the big time...

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Some of the world's biggest stars got their start on the small screen of children's TV.

From Ariana Grande to Emma Stone, take a look through to see which celebrities appeared on the orange network before hitting the big time...