This time the 24-year-old didn’t hook up with Zimbabwe-born Chelsy, though. Instead, fuelling reports of a new love interest, he spent the evening in the company of 27-year-old Astrid Harbord.
The third-in-line to the throne attended the party in a rundown Whitechapel warehouse - which was organised by a socialite friend via Facebook - with two friends. One of them, Jake Warren, was a godson of Harry's late mum Princess Diana.
"Once you paid your ten quid to get in there was a DJ and bar," a fellow partygoer told the Daily Mail. "The atmosphere was wild".
And while Astrid and Harry – currently training to be an attack helicopter pilot – left the party at 1.30am, three-and-a-half hours before it packed up, the blonde Bristol graduate insists there is "nothing going on" between the pair.
It's not the first time the Prince has spent a night out with Kate Middleton pal Astrid. The pair were romantically linked in March when they shared an evening together before returning to Harry's Clarence House flat.