“Wishlist” singer Lily Halpern, 19, is said to be dating Harry Styles, 18, of UK boy band One Direction. Sources say they’ve been seeing each other for a few months, and it’s “getting quite serious.” Halpern was spotted leaving a hotel where Styles stayed with his bandmates when the group performed in New York last month. Styles and the band then performed on “SNL” on Saturday. But a rep for the band told us: “Never heard of her before; Harry is single.”