Zayn's spokesperson confirmed: "Zayn and Perrie are engaged, but any further detail regarding their relationship is private and we ask media to please respect this."
Perrie's mum, Debbie, told the Dorset Echo: "It's official. I'm over the moon. They are really in love.'
Debbie went on to say that Perrie, 20, had been reluctant to make an official announcement before the premiere, as she was concerned it'd overshadow the One Direction movie premiere.
She said: "It's wonderful because Zayn is absolutely gorgeous. It's true they got engaged on Sunday and it's absolutely lovely."
Debbie concluded: "Perrie loves him to pieces and it's perfect. They get on so well together and understand each other. It's just fabulous."
The pair began dating in 2011 after One Direction made an appearance on Little Mix's year on The X Factor.
Their relationship was rocked by claims earlier this year after a waitress claimed she'd slept with Zayn whilst Little Mix were on tour.
However, the pair sorted their differences and seem to be stronger than ever.
Most recently, Zayn, 20, had a cartoon of Perrie tattooed on his arm. Whilst it's not a direct portrait of Perrie, Zayn explained that the image represented 'all the things he likes most' about his new fiancee.
A source told The Mirror: "It was so romantic - Zayn popped the question over the weekend when they were alone together.
“It's one of the first weekends they've spent with each other, as they've both been on tours with their bands.
“He wanted to wait for the perfect moment.”
And it would seem that Perrie was forced to wait to tell her Little Mix band mates as they were partying in the Virgin Media Louder Lounge at V Festival this weekend when Zayn got down on one knee.
The source continued: "All her bandmates were at V Festival, and she couldn't wait to tell them. They're all really excited for her, as the rest of One Direction are for Zayn."
Aw congratulations guys!
[Exclusive One Direction This is Us interview]
[Zayn Malik and Perrie Edwards' relationship 'stronger than ever']