The loved-up duo has been together for several months after meeting when One Direction performed on The X Factor last year, but managed to keep their relationship under wraps until they went for a romantic, ahem, scooter ride.
The couple were seen kissing as they whizzed around on their love-mobile, confirming they were one of pop's hottest pairs.
But the blonde beauty has admitted she was left red-faced over the photos, and not just because she was playing tonsil tennis in them.
But one thing she's pleased about is being with her fella, adding: "Obviously everyone knows that me and Zayn are together and I'm really happy."
And she must be especially happy after her beau snapped up a massive mansion worth a whopping £2.2m earlier this week.
The six-bedroom property is in North London and boasts its own pool.
A source told The Sun: "Zayn is trying to be smart with his money by putting it into bricks and mortar. He fell in love with the house. The deciding factor was the huge indoor swimming pool. He's already planning some pool parties for when the band are back in town."
> IN PICS: ONE DIRECTION'S ROAD TO WORLD DOMINATION