The Country LakeShake Festival in Chicago was in for a treat when some of the biggest female stars in the genre stepped on the stage for a surprise performance.

Maren Morris, Miranda Lambert, Ashley Monroe, Lauren Alaina, Lindsay Ell and Cassadee Pope gathered together where they sang a cover of U2’s “I Still Haven’t Found What I’m Looking For”, with them being seen warming up for the gig in a behind-the-scenes YouTube clip.

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“LakeShake = LAKE SHOOK,” Morris captioned a picture of the gals.

Ell shared her own picture of the ladies on stage.

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Alaina posted a collection of pictures including one where a drink was spilled on her. “I like to call the first photo, ‘the house that SPILT me.’ @mirandalambert That pic was taken right after we all took a bow and @cassadeepope spilled her drink down my back. Zoom in to see the evidence lol. I love all of these ladies.”

Fans turned to Twitter to share clips from the evening. Check them out below.