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Leona Lewis has hit out at Michael Costello and says the designer left her "humiliated" after refusing to dress her for a charity event in 2014.
The singer, 36, shared a lengthy Instagram message on Tuesday describing how she felt body shamed by the designer.
The Bleeding Love singer recalled how Michael's actions on that day led to her having years of mental anguish and "deep insecurities".
She went on to defend model-turned-TV personality Chrissy Teigen for showing "sincere remorse" for her past actions.
Michael, 38, said Chrissy had blacklisted him from the industry and threatened people and brands that they'd blank them if they were in any way associated with him.
And the Project Runway star admits that her behaviour led to him having suicidal thoughts.
Michael Costello claims Chrissy Teigen's actions left him feeling suicidal
(Image: Getty Images)
In her emotional post, Leona revealed that she doesn't condone any type of bully behaviour but wanted to share her own experiences.
The star recalled how she felt "excited" and "honoured" to take part in the Go Red For Women The Heart Truth Red Dress Collection at MercedesBenz Fashion Week in New York in 2014 afterbeing assigned Michael as her designer.
She was was seen at the event wearing a black dress with a blue coat as she sat in the front row instead of being a part of the show.
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She wrote: " When I got to my fitting I was made to feel very awkward and uncomfortable as the dress was a sample size and he/his team clearly did not want to alter it to fit me.
"This came as a total surprise because weeks prior I was told that they would make the dress work for me.At the next fitting, the night before the show, with no explanation at all, Michael refused to turn up.
"He no longer wanted to dress me and he abandoned his commitments to me and the show which made me well aware that I wasn’t the body type required."
Singer Leona Lewis attends Go Red For Women The Heart Truth Red Dress Collection fashion show in 2014
(Image: Getty Images)
Leona says Michael left her "so embarrassed and deeply hurt"
(Image: Getty Images for New York Fashion Week: The Shows)
The 2006 X Factor winner revealed the events left her "so embarrassed and deeply hurt" and she quickly realised that she "was not permitted to walk in his dress".
She continued: "I had to sit in the audience and was asked by press why I didn’t walk in the show.
"I remember having to come up with excuses as I was so humiliated by it all. I feel like I was made to look as though I pulled out and was being difficult and as an affect of those actions I suffered a lot, both personally and professionally.
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"The most hurtful thing is that it was to raise money for charity, and this went against everything we were trying to do."
Leona says the experience left her with deep insecurities which took years to overcome.
She said she's glad the designer has "saw the light" since and admitted "we all make mistakes".
She added: "I know I have, but at this time I feel that when people apologise (Chrissy) and show sincere remorse and rehabilitation for their actions, we should embrace them and not try and kick them when they’re down.
Leona says Chrissy Teigen's apology was sincere
(Image: Patrick McMullan via Getty Images)
"I’m not discounting Michael’s experience as that is an awful thing to go through and I wish him so much love and healing. I’m sure this will come as a shock as I never told him how this made me feel.
"But the pot calling the kettle black in this situation doesn’t sit right with me. Bullying comes in many different forms. We need love, we need accountability, we need forgiveness, none of us are perfect."
Chrissy, 35, has been the target of huge backlash over the past few weeks for her previous comments and said it's been a "very humbling few weeks" and she felt "ashamed" by her actions.
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