Her teacher once threw her out of her voice lessons. The teacher was an opera singer who didn't like the way Jett was dressed.
She is a huge fan of the New York Liberty of the WNBA, and can often be seen sitting courtside at their games.
She began as a member of the all-girl rock group, The Runaways. Future heavy metal queen Lita Ford
was a band mate.
Jett starred in the movie The Light of Day with Michael J. Fox. She also appeared in the stage version of The Rocky Horror Picture Show with a bald head, and acted in a movie about the Runaways called We're All Crazy Now, with actresses playing the other band members. It was never released.
In 1979, she released two songs in Holland that she had recorded with ex-Sex Pistols Paul Cook and Steve Jones.
Her first album features Blondie members Clem Snide and Frank Infante. It was originally titled Joan Jett, but the record label (Boardwalk) renamed it Bad Reputation.
Jett produced many of her own recordings and has done production work for others. Her credits include the Peaches track "I Don't Give A..." and the Bikini Kill song "Rebel Girl."
She was a staunch supporter of the politician Howard Dean, the governor of Vermont from 1991-2003. When Dean ran for President in 2004, Jett accompanied him to the Iowa caucus, where in his speech to supporters, the candidate let forth a scream of excitement that came off as un-presidential. The media seized the moment, and Dean's campaign was doomed. Jett was onstage at the time - she says the media got it all wrong; the scream was not angry but effervescent.
Ricky Byrd, lead guitarist for the Blackhearts, knows the importance of style. In the book MTV Ruled the World - The Early Years of Music Video, when asked if he thought fashion was important to a band's success, he answers: "Oh come on, man, it led everything. Billy Idol was great with videos. People would see them and start dressing like him. Look at Madonna. Would Madonna be so big if video wasn't around, so people could see what she does? If you were a kid, and you just heard one of those songs on the radio, would you be as impressed as if you saw her rolling around on the floor? Shock value is hard to put across on the radio, unless you're Jim Morrison or something like that... if it's just outward sex appeal that's in the words."
Her birth name is Joan Larkin, but she legally changed it in the early '80s. She came up with the "Jett" moniker after hanging out at a Sunset Strip club called Rodney Bingenheimer's English Disco, where all the fabulous people used outlandish names.