The One Direction heartthrob joined the Radio One presenter as they arrived at a swanky closing party for the London Collections, at Sketch.
Dressed head to toe in Burberry, Harry showed no sign of his relationship troubles as he mingled with guests.
During the evening, he also caught up with British funnyman James Corden, and rapper Tinie Tempah.
Harry apparently called time on his whirlwind romance with Taylor Swift after she kept nagging him about other girls.
A source told the Mirror Taylor also had an issue with Harry's close friendship with ex-girlfriend Caroline Flack, revealing: 'Harry and Taylor had an incredibly intense relationship, and really did care strongly about one another.
'Sadly it fizzled out just as quickly, and came to a head following a series of angry spats on holiday.
'Harry felt Taylor was nagging him, quizzing him on his intentions with various women and generally having very little faith in him.
'It all became too much and Harry found her a little too demanding. Taylor probably engineered the split but Harry held all the cards in the relationship.'
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