Big Machine CEO Scott Borchetta hit back at Taylor claiming she had many chances to own her music catalog during negotiations last year, but the singer declined the proposals.
Braun's clients Justin Bieber and Demi Lovato leapt to his defence, while Sia, former Oprah Winfrey Network President Erik Logan and Braun's wife Yael Cohen have also publicly supported him, Spin reports.
Demi Lovato wrote on social media: "I have dealt with bad people in the industry and Scooter is not one of them. He's a good man."
In a scathing Instagram post, Yael Cohen claimed Taylor had been notified of the deal well before the news became public.
"Your dad is a shareholder and was notified, and [Scott] Borchetta personally told you before this came out. So no, you didn't find out with the world.
"And girl, who are you to talk about bullying? The world has watched you collect and drop friends like wilted flowers. My husband is anything but a bully, he's spent his life standing up for people and causes he believes in."
Yael signed off in her caption with the words: "@taylorswift I'm here to talk privately anytime."
Team Taylor has received support from Panic at the Disco's Brendon Urie, who collaborated on Swift's first single outside the Big Machine Label Group, calling the music industry "toxic".
Halsey also said she would "stand with" Taylor in a series of tweets, saying the singer had every right to own her life's work.
British model and longtime friend of Taylor's Cara Delevigne criticised Justin Bieber's wife Hailey Baldwin, saying "I wish you spent less time sticking up for men and more time trying to understand women and respecting their valid reactions."
Canadian songstress Alessia Cara took to Instagram stories to stick up for Taylor, writing: "Stop stealing from women who work hard!!!"
Australian rapper Iggy Azalea, Sky Ferreira, Todrick Hall and the Haim sisters have all taken sides with Taylor.