As if the Jay-Z-sponsored Made in America festival didn’t already have a stellar lineup, rumor has it that Beyonce may be making a surprise appearance!

A source dished to the Huffington Post, “Beyonce will hit the stage in a surprise performance at her hubby’s festival next weekend in [Pennsylvania]. The performance is top secret but it will be filmed for Jay’s documentary about the event. It’s going to be epic.”

The documentary the source speaks of is a concert film produced Brian Grazer and directed by Ron Howard. “The festival showcases 20 pre-eminent artists that speak to the new generation,” Grazer said of the project. “I am producing the film with Steve Stoute and Jay. Ron is directing. It is going to be born through Jay-Z’s perspective … how he puts the event together.”

The concert, which will be held Sept. 1 and 2, is expected to draw 100,000 fans to Philadelphia thanks to performances by DrakeRita OraCalvin Harris, D’Angelo, Afrojack, Run-DMC, Odd Future, Pearl Jam, SkrillexJanelle MonaeRick RossWale and Meek Mill. Now that word is out that Queen Bey may appear, you can bet those numbers, as huge as they are already, will see an uptick.

Listen to Jay-Z + Kanye West, ‘Made in America’ Feat. Frank Ocean