The 28-year-old singer opened the US leg of her "25" tour in St Paul, Minnesota on Tuesday, where one of her fans flew all the way from Australia to see her.
The "Hello" hitmaker got down off the stage to hug the woman, reported Entertainment Weekly.
"I am planning an Australian tour now," she hugged her and said.
"Why don't we get your info and when the Sydney show happens you can come, on us. Well, if the tour happens, I always announce things when I am not supposed to!," the singer quickly added.