\"The heart and beautiful soul you have for paying for everyone,\" she wrote.

Shoppers at the Palm Springs store didn't immediately recognize the superstar since she is known for her oversized wig that hides her face.

\"PHOTO:
David Livingston/Getty Images, FILE
PHOTO: Singer-songwriter Sia attends the 2017 Vanity Fair Oscar Party hosted by Graydon Carter at the Wallis Annenberg Center for the Performing Arts, Feb. 26, 2017, in Beverly Hills, Calif.
>

It's unclear how much money the singer spent on the groceries, but according to ABC News affiliate WBRZ, Sia went to multiple registers and asked to pay for people's items.

Buckles added, \"I’m sorry for telling everyone once I realized who you were !! But this kindness must be acknowledged!!!\"

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