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Speaking to Daily Beast, Courtney, 26, said that Chrissy, 35, had told her to "take a dirt nap" and sent private messages to them encouraging them to kill themselves back in 2011, when they were just 16.
"[Chrissy] wouldn't just publicly tweet about wanting me to take "a dirt nap" but would privately DM me and tell me to kill myself. Things like, "I can't wait for you to die.'," says Courtney - who identifies as non-binary, and uses the pronouns they/ them/ their.
Acknowledging her previous wrongdoing, Chrissy wrote on Twitter on Wednesday: "Not a lot of people are lucky enough to be held accountable for all their past bullsh*t in front of the entire world.
"I'm mortified and sad at who I used to be. I was an insecure, attention seeking troll. I am ashamed and completely embarrassed at my behaviour but that is nothing compared to how I made Courtney feel.
"I have worked so hard to give you guys joy and be beloved and the feeling of letting you down is nearly unbearable, truly.
"These were not my only mistakes and surely won't be my last as hard as I try but God I will try!!
"I have tried to connect with Courtney privately but since I publicly fuelled all this, I want to also publicly apologize. I'm so sorry, Courtney. I hope you can heal now knowing how deeply sorry I am."
Addressing her 13 million Twitter followers, John Legend's wife added: "I am so sorry I let you guys down. I will forever work on being better than I was 10 years ago, 1 year ago, 6 months ago."
Other Tweets Chrissy can be seen to have sent Courtney in 2011 include one which reads: "My Friday fantasy: you. dirt nap. mmmmmm baby."
Meanwhile, another tweet says: "'go. to sleep. forever.'(sic)".
While it is unclear what the cause of Chrissy's dislike for Courtney was, they have theorised in a video to fans, taken last April, that it centred around their controversial marriage to Doug Hutchinson - who was 51 at the time, and 31 years their senior.
Reacting to Chrissy's apology, Courtney wrote in an Instagram post: "I accept her apology and forgive her but the truth remains the same, I have never heard from her or her camp in private.
"In fact, she blocked me on Twitter. All of me wants to believe this is a sincere apology, but it feels like a public attempt to save her partnerships with Target and other brands who are realising her 'wokeness' is a broken record."
Tyla has reached out to Chrissy for comment.
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