Zara Larsson says guru James Charles private messaged her boyfriend on ...

Zara Larsson has said YouTuber James Charles sent private messages to her boyfriend on Twitter despite 'knowing damn well he's straight'.

The singer, 21, made the claims after James, 19, came under fire after fellow YouTuber Tati Westbrook uploaded a 43-minute video entitled 'Bye Sister' where she outlined several reasons why she was ending her friendship with him. 

The video prompted Zara to take to Twitter to claim that James had sent a message to her boyfriend Brian Whittaker.

Tweet: Zara Larsson has said YouTuber James Charles sent private messages to her boyfriend on Twitter despite 'knowing damn well he's straight'

Tweet: Zara Larsson has said YouTuber James Charles sent private messages to her boyfriend on Twitter despite 'knowing damn well he's straight'

In a now deleted tweet, she wrote: 'I'm cackling cause he hit up my boyfriend in the DMs several times knowing damn well he's straight.'

She later wrote: 'I feel like deleting this cause I checked and it wasn't several times, only one DM and some comments under pictures.' 

In the video, Tati, 37, said that James' choice to promote a competitor to her own company was just the latest example of bad behavior — which included James making advances on men he knew to be straight, manipulating others' sexuality, and speaking crassly about sex in front of her friends and family. 

Zara later deleted both of her tweets and wrote another one, expressing regret at getting involved in the controversy. 

Drama: In a now deleted tweet, she wrote: 'I'm cackling cause he hit up my boyfriend in the DMs several times knowing damn well he's straight'

Drama: In a now deleted tweet, she wrote: 'I'm cackling cause he hit up my boyfriend in the DMs several times knowing damn well he's straight'

Change of heart: Zara wrote another tweet, expressing regret at getting involved in the controversy

Change of heart: Zara wrote another tweet, expressing regret at getting involved in the controversy

She wrote: 'It made me really uncomfortable cause I felt like it was unproportiunally blown up and I honestly don't wanna be a part of it. 

'I feel like I shouldn't have made my self involved, even if the behavior is problematic in general.'

MailOnline has contacted both James Charles and a representative of Zara's for further comment. 

The feud has inspired a number of celebrities to unfollow James from YouTube. According to Metro, these include , Kylie Jenner, Demi Lovato, , Katy Perry, Iggy Azalea, and Shawn Mendes. 

She wrote: 'It made me really uncomfortable cause I felt like it was unproportiunally blown up and I honestly don't wanna be a part of it'

She wrote: 'It made me really uncomfortable cause I felt like it was unproportiunally blown up and I honestly don't wanna be a part of it'

James and Tati had enjoyed a years-long friendship, with Tati driving traffic toward James' pages and praising him in videos.

But their feud began when James attended the Coachella music festival on April 22 and promoted Sugar Bear Hair vitamins on his Instagram Story.

The company — which promises to strengthen and add shine to hair — is in direct competition with Tati's supplements, Halo , a brand James said previously wasn't the right fit for his young followers.

Fall out: The online feud has inspired a number of celebrities to unfollow James from YouTube

Fall out: The online feud has inspired a number of celebrities to unfollow James from YouTube

Tati, who helped bolster and grow James' career, was left frustrated and posted videos in her own Instagram Stories about feeling 'betrayed.'

 This is ultimately what led Tati, who goes by @GlamLifeGuru, to release a lengthy video entitled 'Bye Sister' on May 10 — the damning tirade that has now sparked a huge follower loss for her former protégé.

Speaking about the vitamin promotion incident, she said: 'James Charles, he had nine days after Coachella to talk to me, he knows where I live — he could have come face-to-face and chatted with me because he knew that this would

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