The couple have been almost inseparable since they were introduced by their mutual friend Justin Bieber at an awards ceremony.
The relationship cooled briefly when Styles was spotted with New Zealand-based model Emma Ostilly, 18, while he was on tour Down Under.
Swift then began dating 18-year-old Conor Kennedy, a relative of the late US president JFK, but she and Styles were reunited backstage at the BBC Radio One Teen Awards in October. She was heard openly discussing her relationship with Styles at last weekend’s Capital Radio Jingle Bell Ball at London’s 02 Arena.
“We do normal things, like go out to eat, take pictures and make videos. He’s cute, incredibly good looking, smells good and I’m enjoying the flirtation,” she said. “Meeting him is just one of the most amazing things that has ever happened to me.”
She admitted that she worried about their future, saying, “The future, the past, the present, where’s this all going? It’s like everything. But things are good”.