"I am really, really, happy," JoJo said in an Instagram video on Saturday.
"I always believed that my person was just going to be my person," she went on. "And if that person happened to be a boy, great, and if that person happened to be a girl, great!"
"I have thought about this," she said when asked about her labels. "And the reason why I'm not ready to say this answer is because I don't really know this answer."
The news was met with a flood of congratulations and joy from fans, who said how important it was for JoJo — who has a huge influence over young children — to encourage kids to be true to themselves.
And among them was Abby Lee Miller, who shared a selection of throwback photos with JoJo alongside a congratulatory message calling her a "shining example."
"I always knew the world would be a more colorful, positive, sparkly place with a kind, loving, dazzling triple threat like you in it," Abby Lee wrote.
"Love you kiddo!!!" she added. "Keep making me proud."