Zayn Malik gives Perrie Edwards lingering kiss goodbye before US tour
The couple, who were first linked in November after they got chatting when they recorded The X Factor charity single together, shared a big hug and messed around on a scooter in London while they waited for Zayn to be picked up.
'It was a very sweet farewell,' a source tells The Sun.
'You could see they are genuinely really into each other.'
The pair have been getting close over the past few months and have decided to give a relationship a go, despite their busy pop star schedules.
Zayn, 19, and Perrie, 18, first sparked rumours they were together back in April when they chatted on Twitter.
'Just went to see avengers assemble and it was #boring. Good night though! xD @zaynmalik,' Tweeted Perrie.
'@PerrieLittleMix yeah tonight was fun lets do it again sometime ;) x x,' replied Zayn.
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