The 27-year-old British singer-songwriter, who dated band member Zayn Malik in the past, said the group have always been with May, and Styles has become one of her favourites, reported Contactmusic.
"She (Lilly May) is a little bit of a fan, she loves Harry Styles, they used to play backstage in the corridors and him and her they just got on - but she is not a die hard fan," Ferguson said.
But the 'I Hope' singer said her children have started to listen to more indie and rap music, although she won't let them listen to explicit lyrics.
"I don't really speak to him, so no not really (I haven't given him congratulations). I would if I had seen him, but I haven't spoken to him in years it has been a long time. It's been two years," she added.
Rebecca is now in a new relationship but she remains tight-lipped about her man's identity.