The One Direction singer arrived with Mick Jagger's 20-year-old daughter to a London Fashion Week party, according to the Daily Star.
"At the beginning of the night Harry and Georgia May tried to get into Stella McCartney's fashion week party together but came too late and were refused entry," an insider claimed.
"To avoid photographers they then separated, getting into different taxis to head to Stella's after party at Mason's Yard. Inside Georgia May was said to be following Harry around like a lovesick puppy," the source continued.
The supposed onlooker alleged that the pair were invited to model Kate Moss's house, adding: "Afterwards they both left Mason's Yard at 3.30am where they again got into different taxis to head to Kate Moss's house where the party continued."
Since separating from Xtra Factor host Caroline Flack last month, Styles has been linked with Pixie Geldof.
> One Direction Harry Styles, Caroline Flack 'haven't ruled out reunion'