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19 August 2012, 18:30
The 'One Thing' singer was reunited with his former flame at a mutual friend's birthday in the UK capital.
Harry Styles and Caroline Flack both attended the same party event in London last night, although the two stars were spotted leaving separately after the festivities were over.
The 'What Makes You Beautiful' singer enjoyed a short romance with The Xtra Factor presenter for several months after the end of 2011, after meeting during Harry and One Direction's appearance on the ITV2 sister show.
Harry was pictured leaving the Soho Sanctum hotel last night (18th August), where Caroline was also confirmed to be attending while celebrating the birthday of a mutual friend.
According to The Metro Harry and Caroline were said to have spent some time together at the party, before Harry was pictured leaving the event dressed in a grey denim jacket and black skinny jeans.
This weekend Harry's bandmates Liam Payne, Louis Tomlinson and Niall Horan have set up camp at V Festival 2012, in a unique London Underground themed tent, where they have been enjoying music from some of pop's hottest acts.
The annual event in Chelsea was also attended by Louis's girlfriend Eleanor Calder and Liam's girlfriend Danielle Peazer, with the latter being pictured looking loved up in the sun yesterday afternoon.
Check out a picture of Harry Styles below (Credit: Big Pictures):
Bandmate Zayn Malik did not attend the festival as he was spotted supporting girlfriend Perrie Edwards for Little Mix's live show at London's G-A-Y nightclub last night.
One Direction are currently working on their second studio album, the follow-up to 2011 debut 'Up All Night', and have promised fans the record will be out before the end of the year.