Stevie revealed their true identity in a series of Instagram and TikTok posts after cutting their hair short and showing off their quirky fashion sense for followers.
In one post, they wrote out their pronouns, telling fans: "call me Stevie (they/she/he)," which was liked by , Eminem's biological daughter with Kim.
A video also shows their transformation over the years, with the words: "Watch me become more comfortable with myself," and "forever growing and changing."
In the clip, Stevie shared photos of themselves as "Whitney" and using the pronouns she/her, before transforming to "Stevie" and using "all pronouns".
They used the hashtags #genderfluid #bi and #nonbinary in several posts.
Followers have sent Stevie a stream of supportive comments since they came out, with one writing: "ugh we love this for you!!!!! stevie is such a lovely name too i love this."
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After they wiped all others photographs from their Instagram feed to start fresh, another fan posted: "Welcome back beautiful we missed you."
A third added: "SO PROUD OF YOU STEVIE WE LOVE YOU."
The teenager's new name was referenced in their grandmother Kathleen Sluck's obituary late last month - which was posted before Stevie's mother reportedly tragically tried to take her own life.
It read: "Kathleen was a exceptional mom to her two daughters; Kim and Dawn; and was overjoyed to become a grandmother to her grandchildren; Alaina, Adam, Hailie, Stevie, P.J., and Parker."
GENDER JOURNEY
A tribute on the site from one of Stevie's friends, Brooke, also read: "I know me and Stevie drove you crazy with our endless sleepovers of you calling us telling us to stop being so loud..
"And to go to bed and our early mornings with you for our Tim Horton runs and always sitting on the back porch talking with you and listening to all your stories."
Stevie's father is Kim's ex-boyfriend Eric Hartter, whom she got together with during a break from , and the superstar adopted her after they reconciled.
Kim and Eminem, 48, first tied the knot in 1999 and divorced two years later. They remarried in January 2006 but had broken up again by April of that year.
Stevie's biological dad, a professional tattoo artist, had various run-ins with the law and was in and out of prison as he reportedly battled drug addiction. He died last year aged 40.
Eminem raised his child, along with Hailie, now 25, and , 28, whose mother is Kim's late twin sister Dawn who died of a drug overdose in 2016.
He regularly raps about all three children in his songs, including hit Going Through Changes.
Meanwhile, the sisters are going through a tough period after grandmother Kathy's death and their mom following a
Cops rushed to the 46-year-old's home in Macomb, on July 30 after receiving reports of a suicidal person, according to .
FAMILY TRAGEDY
Kim, who attended her mother's funeral just the day before, was allegedly combative when police arrived and had to be restrained by deputies, according to law enforcement sources.
She was found with cuts on the back of her leg and paramedics were unable to check her vitals, the outlet reported.
Kim was then reportedly transported to the hospital for both medical and psychological evaluation, before returning home for recovery.
A user claiming to be Kim previously posted an emotional comment on her mom's online tribute page, writing: "I don't even know where to begin mom!!! First off I’d like to say I F****** LIED TO YOU WHEN I SAID I WOULD BE OK….I LIED WHEN I SAID I CAN DO THIS I PROMISE!!!! F***** f*** all!!!
"I don’t even know how to do this without you I just wanted you to not hurt or suffer or fight for me anymore!!! But I’m sure you know that!!!
"You’ve been the support and back bone for me and my kids and I can’t thank you enough.
"You've taught me how to be a fighter and not take sh** and tried to teach me to love myself as much as you loved me!! You’ve be there for every fall I’ve had and BOY WAS THERE A LOT!!!
"You’ve taught my kids how to love and respect others and also how to be just as crazy as us when needed.
"We’ve had our riffs but not one second of one day would I not have given my last breath for you. Even now I’d rather it be me than you!!! You’re all I had left momma!!! What do I do now??
"How can I go crazy anymore without you here to be the strength and kick in the a** I need to get better???! I hope you know how f****** much I love the sh** out of you and how much the kids love you!!! I hope you know every choice I made was to make you a little happier and your life a little easier!!!"
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In 2015, Kim also confessed to trying to take her own life after crashing her car while drunk.
She struck a utility pole and her SUV landed upside down in a ditch.