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Zoella Girl Online book is fastest-selling debut novel

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Hayley looks back at a big year for Zoella

YouTube star Zoella's first book has become the fastest-selling debut novel ever.

Girl Online sold more than 78,000 copies in its first week.

Zoella tweeted: "I'm legit blown away by this. I never in a million years thought that so many of you would pick up a copy of Girl Online. Almost want to cry."

She has more than 6.6 million followers on YouTube, where she posts beauty and fashion videos.

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Zoella tells Ricky how she's dealt with cyberbullying (from February 2014)