The pair - who have thus created the best pop pairing since Marvin Humes and Rochelle Wiseman - were pictured locking lips in a North London street as Perrie said a lingering goodbye to Zayn as he headed off to the States on tour with the rest of his band.
A source told The Sun of the relationship: "It was a very sweet farewell. They hugged, snogged and mucked about on a scooter while they were waiting for Zayn to be picked up. He was giving her lifts along the road. You could see they are genuinely really into each other.
"Both were dubious whether they could make it work due to the pressure of their pop star statuses - but they decided they like each other too much not to give it a go. So they've spent months getting to know each other to make sure they were on track before they went public," they added.
After the snaps went public, it wasn't before long that One Direction's infamous fans waded in on the romance.
However, despite their previous history of rejecting their beloved lads' girlfriends (hello Caroline Flack), it seems they've taken to Perrie and have already given the couple the nickname of Zerrie, when 'Directioners RESPECT Zerrie' started trending on Twitter.
Zayn and Perrie were seen leaving her house last week after Zayn spent the night at her house.
Rumours first surfaced about the couple last year while Perrie was still competing on The X Factor.
The pair were said to have started seeing each other after swapping numbers when One Direction appeared as guests on the show.
She told us at the time: "I've heard rumours too. It's mad isn't it? I've heard rumours we're dating but it's the first I've heard.
"At the moment I don't have time for anything like that. I'm so focused on this now. We've just won The X Factor. We've got the tour coming up, the single's coming out, we're going to start working on the album after the tour. I just don't really have the time to date anyone unfortunately."
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