The couple garnered their fair share of headlines during their brief fling, sometimes because of the 14-year age difference between the pair, reported Digital Spy.
Reflecting on her time with 21-year-old Styles, Flack, 35, said she understands why people are fascinated by the relationship
"Being asked about the Harry thing doesn't bug me. People are interested in those sort of things because they're in the public domain, so you just learn to laugh it off. It's funny, it's not serious," Flack said.