The singer stayed incognito while jogging around the neighborhood on Monday (February 17) in London, England.
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The former One Direction heartthrob was snapped by paparazzi as he stepped out, wearing a navy blue hoodie, Nike joggers, shades and a beanie hat, teamed with bright red trainers and sunglasses to stay under cover.
Harry is currently gearing up for his performance at Tuesday night's Brit Awards. He is also nominated for two awards at the event.
The 26-year-old musician heartthrob had a three-month romance with the late Love Island host in 2011 when he was 17 and she was 32, meeting when Caroline was fronting X Factor