According to The Mirror, the Story Of My Life singer has rekindled his romance with the British beauty after there was 'definite chemistry' between them at 1D hair stylist Lou Teasdale's book launch at the Ace Hotel in London on Tuesday (March 25).
The tabloid claims the pair were 'flirting heavily', with an insider revealing: "They see each other whenever they are in the UK and have been really close for a while now.
"Harry really likes her, not just because she’s beautiful, but he also thinks she’s cool and down to earth. They’re both Northern, so have a similar sense of humour.”
As well as spending time with Marshall at Teasdale's book event, the 20-year old hunk also bumped into former flame Caroline Flack, with the newspaper adding their meeting wasn't too awkward as they 'exchanged pleasantries'.