A furious Taylor Swift has ignited her latest celebrity feud via a social media takedown she wrote after her master recordings were sold to her nemesis, celebrity manager Scooter Braun.

“All I could think about was the incessant, manipulative bullying I’ve received at his hands for years,” Swift wrote on Tumblr about Braun.

Swift in New York on June 14. Photo: Getty

“This is my worst-case scenario,” said the 29-year-old.

“Essentially, my musical legacy is about to lie in the hands of someone who tried to dismantle it.”

Swift’s reveal of the dark side of the music industry saw a deluge of more than 250,000 tweets of support and spawned the viral hashtag ‘We Stand With Taylor’.

On June 30 it was announced Braun’s media holding company Ithaca bought the rights to Swift’s back catalog of six albums from her old label, Big Machine Label Group, for $428 million.

Swift’s lengthy and emotional post also called out Justin Bieber, Kanye West and Kim Kardashian West, rehashing a bitter public war over West’s 2016 song Famous.

It featured him rapping, “I feel like me and Taylor might still have sex/I made that bitch famous” and its “revenge porn” music video stripped “my body naked”, Swift said in her letter.

The photo of Kanye West and Braun that Swift posted with her letter. Photo: Tumblr

Iggy Azalea, Allie X and Carlie Hanson rushed to give Swift props.

“Taylor Swift is a huge reason why I always insisted to write my own music. She deserves to own the painstaking labour of her heart,” said Bad at Love singer Halsey.

Bieber clapped back, defending himself and his long-time manager Braun on Instagram, chiding Swift for “crossing a line” while telling Swift “Scooter and I love you … we truly want the best for you.

“Scooter and I would love to talk to you and resolve any conflict.”

View this post on Instagram

A post shared by Justin Bieber (@justinbieber)

Bieber’s involvement drew scorn from actor and model Cara Delevingne.

“I wish you spent less time sticking up for me and more time trying to understand women and respecting their valid reactions,” tweeted Delevingne to Bieber.

Actor Elaine Hendrix was another to have Swift’s back, channelling her The Parent Trap character Meredith Blake.

Me with anyone throwing shade at @taylorswift13. Literally me.
🔥😈#WeStandWithTaylor pic.twitter.com/YvYTPuCfnD

— Elaine Hendrix Ⓥ (@elaine4animals) July 1, 2019

https://twitter.com/starlightsiyeon/status/1145503822145556480

me deleting taylor swift, fearless, speak now, red, 1989, and rep from my spotify playlist because i refuse to give scooter braun money:#WeStandWithTaylor pic.twitter.com/J7owPJPy8U

— L (@lcbiene) July 1, 2019

Bieber’s semi-olive branch is unlikely to appease Swift, who said she learned Braun had bought her masters as it was announced to the world”.

The Shake It Off singer parted ways with Big Machine Label Group in 2018 when the 12-year contract she signed at age 15 ended.

Swift and Justin Bieber were tight at the 2011 Teen Choice Awards. Photo: Getty

In her Tumblr letter, she insisted she “pleaded for a chance” to own her work, but instead was offered a re-sign with the right to earn back an album for each new one released.

“I had to make the excruciating choice to leave behind my past.

“Music I wrote on my bedroom floor and videos I dreamed up and paid for from the money I earned playing in bars, then clubs, then arenas, then stadiums.”

Swift added that “never in in my worst nightmares” did she think her masters would be sold to Braun.

“Any time [Big Machine Records CEO] Scott Borchetta has heard the words ‘Scooter Braun’ escape my lips, it was when I was either crying or trying not to,” she said.

Braun’s wife Yael Cohen Braun, founder of health organisation F–k Cancer, also got involved by defending her husband on Instagram and urging Swift to “get her facts” straight.

“What you haven’t seen is what happens behind closed doors, when he has supported and stood up for you,” Ms Cohen Braun wrote to Swift.

“The world has watched you collect and drop friends like wilted flowers.”

https://www.instagram.com/p/BzWfMAWAIkE/?utm_source=ig_embed

Swift ended by saying her new label Republic Records is more supportive, and her masters from upcoming album Lover, dropping in August, will be hers to own.