The 42-year-old came to Costello's defense after he came forward with allegations against Teigen where he claimed that she and stylist Monica Rose went "out of their way to threaten people and brands that if they were in any shape or form associated with me, they would not work with any of them" following a misunderstanding.
"So disgraceful," Rossi reportedly commented before Costello closed the comments on the post, per Page Six. "I’m so proud of you for speaking up and sharing your truth about what happened my sweet friend."
"This disgusting person has shown over and over again who she is and what she is capable of," she continued. "No one should ever say the things she said to you or the many others she has been so cruel to. You are so loved and supported!"
Costello claimed that Teigen tried to blacklist him in the fashion industry after she "apparently formed her own opinion of me based on a Photoshopped comment floating around the internet which has now been proven to be false by Instagram and since taken down." When he reached out to try to explain, the 35-year-old allegedly "told me that my career was over and that all my doors will be shut from there on."
"Good! racist people like you deserve to suffer and die," the model reportedly said when he told her that her comments were adding fuel to the fire at the time.
Costello said that jobs he had lined up began to get canceled, and he would later hear from others that Teigen and Rose were allegedly responsible.
"So many nights I stayed awake, wanting to kill myself," he admitted. "I didn't see the point of living. There was no way I can ever escape from being the target of the powerful elites in Hollywood, who actually do have powers to close doors with a single text."
"As a result of what Chrissy Teigen did to me in 2014, I am not okay...To this day, I am still not able to recover from the years of trauma I have experienced," he wrote, admitting that he had been contemplating suicide only a week prior.
Costello's claims came hours after Teigen returned to social media with a lengthy apology on Medium following non-binary model Courtney Stodden's accusation that the mom-of-two cyber-bullied them when they were 16 and engaged to actor Doug Hutchison.
"I’ve apologized publicly to one person, but there are others — and more than just a few — who I need to say I’m sorry to. I’m in the process of privately reaching out to the people I insulted," Teigen noted.
"There is simply no excuse for my past horrible tweets. My targets didn’t deserve them. No one does. Many of them needed empathy, kindness, understanding and support, not my meanness masquerading as a kind of casual, edgy humor," the Cravings author added.