One lucky Adele fan struck gold when she reached under her seat to find a handwritten letter from the British singer herself, at Thursday's concert in Auckland.

Rebecca Crotty-Jones took to Instagram to share her delight that her friend, one of 40,000 concert-goers, was the only fan to get the letter.

 Rebecca Crotty-Jones with her mum at the first Adele Concert at Mt Smart Stadium. Picture / Supplied
Rebecca Crotty-Jones with her mum at the first Adele Concert at Mt Smart Stadium. Picture / Supplied

"Thank you for coming to my first show in Auckland," it read. "I'm very excited to be here. I never thought I'd come.

"Are you from New Zealand. I ate some Kiwi chocolates today they were 100," Adele wrote.

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When your friend from high school @jazminenixoncakes gets the #letter under her seat from @adele you are 💯 😍

A post shared by Rebecca (@rebeccacrottyjones) on

The Grammy-award winning songstress even began the letter with "Kia Ora".

We know what we will be looking for at tonight's concert.