"She has touched so many lives it's hard to imagine things without her," the message concluded.
"She was a very special person xxx."
London Metropolitan Police released the details of the collision, stating: "Police were called at 08:36hrs on Friday, 12 July to reports of an electric scooter being in collision with a lorry at Queenstown Road, junction with Battersea Park Road SW8. Officers and London Ambulance Service attended. A woman in her 30s had suffered serious injuries and was sadly pronounced dead at the scene."
Although Emily wasn't named in the police report, numerous reports have identified the star as the victim.
Tributes have poured in after Emily's tragic death.
“My heart goes out to Emily’s family and friends,” said TV presenter Davina McCall wrote on Instagram.
“Such a shock. Sending you love and prayers.”
"I honestly can’t believe this 😭 sending her friends and family so much love I absolutely loved Emily’s account it was so full of light and positivity 💗" said fellow YouTuber, Maddie Bruce.
YouTube Creators Twitter also paid its respects to the star: "We're deeply saddened to learn about the tragic loss of a truly talented British creator, Emily Hartridge. Our thoughts and condolences go out to all of her loved ones and fans," they tweeted.