Delaware’s annual Firefly Music Festival is set to reveal its lineup this week, but it might already be out there in the world. A Twitter account called @EDMsecrets shared a leaked poster Friday that appears to be legitimate. If so, Firefly’s lineup will include headliners Paul McCartney, the Killers, and Kings Of Leon plus Morrissey(!), Modest Mouse, Run The Jewels, Spoon, Charli XCX, Twin Peaks, DJ Mustard, Tove Lo, Slyvan Esso, Sturgill Simpson, How To Dress Well, Ryn Weaver, and more. Not bad! Here’s the alleged poster:

BREAKING: We have the lineup for Firefly Festival @LiveAtFirefly #FireflyFirstLook pic.twitter.com/kZZ0mdevKN

— EDMsecrets (@EDMsecrets) January 24, 2015

The News Journal offered up several compelling arguments that the poster is the real deal. For one, thus far Firefly has confirmed seven artists — Spoon, Run The Jewels, Elliphant, Empire Of The Sun, Bastille, Chiddy Bang, and Cheerleader — all of which appear on the poster. Secondly, Firefly director Greg Bostrom said one of the acts from the Big Barrel Country Music Festival would also appear at Firefly, and Sturgill Simpson is on the Big Barrel lineup. Finally, why would a fake poster include a relative unknown like Newark pop-rock act Fiancé? Having just inked a deal with SQE Records, they’re exactly the sort of new label signees who would be at the bottom of a festival poster. We’ll only have to wait a few days or less to find out if this is legit, but it sure looks legit.

Firefly is 6/18-21 in Dover, Delaware. Get more info here.