Alicia Silverstone has already won Halloween with her costume

There may be a week to go, but we reckon we've already found the best celeb Halloween costume this year.

Or maybe the best costume overall. Alicia Silverstone was snapped behind the scenes at Lip Sync Battle over the weekend, dressed in her most iconic Clueless outfit. That's right, Cher Horowitz's yellow checkered suit is back. While it's not clear if this was a special Halloween episode (although how amazing would that be?), it does make for the perfect throwback photo. https://twitter.com/chrissyteigen/status/921962629270093830?ref_src=twsrc%5Etfw&ref_url=https%3A%2F%2Fwww.glamour.com%2Fstory%2Fchrissy-teigen-just-fangirled-hard-over-meeting-alicia-silverstone Chrissy Teigen, who hosts the show, was over the moon when she saw the actress' ensemble - and asked for a quick photo with her and baby Luna. She tweeted:

"How am I supposed to sleep? I think I've asked for 2 photos in my entire life. @AliciaSilv and Beyonce."

The Clueless star was joined on the episode of Lip Sync Battle by her American Woman co-star Mena Suvari. https://www.instagram.com/p/BaiaHe_A_or/ There's no word (yet) on what either one will be singing, but we're hoping Alicia will be taking on one of the songs from the film's soundtrack. Or maybe she'll try her hand at Iggy Azalea and Charli XCX's Fancy, after the music video featured the singers dressed as Cher and her BFF Dionne. Featured image via Getty.