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Patrons at newly opened Dallas restaurant Resident Taqueria, had a surprise server this weekend: Annie Clark, a.k.a. St. Vincent.

St. Vincent’s sister, Amy Savoie, confirmed to PEOPLE that the singer pitched in on the wait staff at the Dallas establishment.

Photos of St. Vincent working at Resident Taqueria surfaced online, as did reviews of her service. “She was WORKING. Clearing tables. Restocking Topo Chico. She refilled the napkin dispenser on our table. This is a strange world,” Dallas Morning News editor Tom Steele wrote on Twitter.

On Friday, St. Vincent posted a photo of Resident Tacqueria to her Instagram account. Check out that picture, plus a shot of her in action, below.