SIA is known for hiding her face behind a distinctive wig.
But she also tried to disguise her generosity on Thanksgiving, as she surprised shoppers in California.
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The 43-year-old singer went undercover to pay for everyone’s groceries, on Wednesday.
The Chandelier hit-maker pretended to be a lottery winner and paid for items at each cash register in the store in Palm Springs.
The Australian popstar insisted that her name was Cici, as she attempted to keep her identity a secret.
A few of the customers recognised the star and took video which they shared to Twitter.
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In one video, a shopper can first be seen walking over to Sia and giving her a bunch of flowers while hugging and thanking her.
Sia then continues to finalise a payment, before pulling out her credit card and asking: ‘Who’s next?’
‘So Sia paid for my groceries today thank you so much!!,’ the shopper wrote adding: ‘The heart and beautiful soul you have , adding: for paying for everyone!!.”
‘I’m sorry for telling everyone once I realised who you were !! But this kindness must be acknowledged!!!’
