Pansexuality often goes hand in hand with another term, omnisexuality.
"Doesn't have to be a girl, or a guy, or ... you know, a he, a she, a this, or that," Thorne told ABC. "It's literally, you like personality, like you just like a being."
Last year, Grammy-nominated singer Janelle Monae also came out as pansexual in an exclusive interview with Rolling Stone.
Monae spoke to the magazine about being in relationships with men and women and said that while she initially identified as bisexual, after learning about pansexuality, she realized she identifies with it as well.
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Other celebrities that have spoken out about being pansexual: Miley Cyrus, Laci Green, Angel Haze and Jazz Jennings.
“I want young girls, young boys, nonbinary, gay, straight, queer people who are having a hard time dealing with their sexuality, dealing with feeling ostracized or bullied for just being their unique selves, to know that I see you,” Monae told Rolling Stone.
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Many Twitter users embraced Monae for speaking out.
Read Monae's full interview with Rolling Stone.