Fri., Oct. 13

" She's got girls/Girls all over the world/She's got men/Every now and then/But she can't make up her mind/I'm just here to fill her time/It's the only way she can unwind ... AC/DC, she's got some other woman as well as me!" Joan Jett didn't write that song - the British glam-rock band the Sweet did back in the mid-'70s - but it sure fits Jett like a glove. (Check out the video with Carmen Electra as an object of desire.) Jett's never actually come out of any closet as far as we know, but neither has she left her fans clueless as to her orientation. And, you won't find a woman more devoted to rock 'n' roll of a certain era - that aforementioned Sweet period - and more dedicated to keeping it alive through covers and her own rock 'n' roll. We caught her on the Warped tour this summer and had to smile in amazement. She looks the same as she has for years - slim, sexy, tough as nails - and she and the Blackhearts play rock 'n' roll with heart and balls. Her heyday - the days of "I Love Rock 'n' Roll" - may be past, but Jett's got a vital present and future in clubland. And that's where she - with the Eagles of Death Metal and Valient Thorr opening - is Friday Oct. 13 in Boston. Jett and the Blackhearts play Avalon. Tickets: $25.  15 Lansdowne St., 617-262-2424 livenation.com