The 19-year-old singer fuelled dating rumours when he was seen rushing to Delevingne after her show recently and the two posed for a pictured together, reported E!Online.
Styles shot down the rumour during a show.
Asked are you looking forward to seeing your girl Cara walking down the runway, the singer replied, "She's not my girl! I know what you're doing."
The singer thinks people are interested in the model's because they find her eyebrows attractive.
"It's probably them eyebrows, yeah, probably them," he said.