Makeup guru and Youtube star James Charles has reportedly lost over 2 million followers, after long time friend Tati Westbrook allegedly exposed his problematic ways.

The 19-year-old beauty vlogger runs an incredibly successful page – amassing around 16 million subscribers in the past three years – but the feud appears to have derailed his popularity.

Recent controversy around meet-and-greet tickets for his fans hasn't helped his cause, either.

In a 40 minute video, Tati Westbrook called out James and accused him of being unsupportive, after a flurry of videos endorsing Sugar Bear Hair supplements were uploaded to his Instagram account. Tati is in direct competition with Sugar Bear Hair through her Halo Beauty supplement brand, and viewed this endorsement as in bad taste.

Although James eventually apologised, Tati released a video of her own accusing him of inappropriate behaviour and unsavoury comments.

In his initial response, James directly apologised to Tati and her husband for letting them down, adding that they'd acted like "parental figures" for him in LA.

"What sucks the most is that I know there's nothing I can say or do to ever earn that friendship or trust back but I don't blame them for it," he stated.

"A lot of the time when I've had to address things in the past, I've acted out of impulse and I've gone off and tried to pull receipts or facts or screenshots and play the victim and I'm not doing that today, I'm not. That is all I have to say, I'm sorry."

And according to the website Socialblade – which tracks social media statistics and analytics, specifically YouTube – James' page on the video-sharing platform has fallen from 16,553,579 subscribers as of May 9, to 13,908,888 at the time of writing.