The YouTuber has headed to New York City with her boyfriend Alfie Deyes to celebrate the special occasion, and although she's probably having the time of her life, she's still keeping in touch with her fans.
“Thank you so much for the birthday messages, they’ve been so lovely to wake up to!” she wrote on Twitter.
For the occasion, Zoella is encouraging her fans to donate to charity. “If you’d like to help me celebrate I’d love for you to donate to @MindCharity through my JustGiving page, big or small, it all makes a difference!”
She continued, “.@MindCharity was one of the first places I turned to when trying to understand my anxiety. They do such amazing work and with our support they can continue helping people who are suffering. If you’d like to donate that would be amazing.
“If you’re not in a position to donate I’d be so grateful if you could retweet these tweets and help spread the message far and wide, @MindCharity has lots of resources to help anyone suffering with their mental health. You’re not alone.”
Watch her birthday vlog below: