The 18-year-old One Direction member is known for liking older women and approached the 32-year-old, who shot to fame in the US after starring in the Bachelorette while on tour.
But Harris laughed off his request, saying: ‘I am way too old for you.’
She added: “He asked for my phone number. He looked cute and adorable. But he was also very young looking. I am sorry but I could never date an 18-year-old. I don’t think that’s even legal in the U.S. is it?”
The X Factor star, who dated 32-year-old TV presenter Caroline Flack, allegedly walked up to Harris’ table in the W Hotel and asked for her number.
But his confidence wasn’t knocked when Harris turned him down.
She said: “I can’t remember what I said. I don’t think I was rude. He didn’t seem too put out. He was very sure of himself actually.
“Harry is cute and if I was 21, I would be all over him.”
Harris added: “I was super flattered!”
Harry also hooked up with a 24-year-old photographer Sarah-Louise Colivet while in New York on tour.
One Direction are currently on the Australian leg of their tour.