But before you all go out and start buying your hats, it was just her prom dress from back in the day!
Feeling nostalgic, the X Factor star couldn't resist trying on her fancy gown once more, even if it did look slightly bridal.
Taking to Instagram, Perrie shared a photo of herself in her prom dress. Her fancy frock featured a jewell-embellished corset and huge skirt encrusted with gems. Looking slightly like she was about to head down the aisle, it's no surprise fans quickly mistook the snap for a wedding gown.
Clearing up any confusion, the 21-year-old wrote alongside her post: "Just put my old prom dress on... I feel like a princess right now!"
While one fan commented: "I just had a heart attack." Another didn't seem so convinced Perrie's frock was for prom, saying: "I bet it's her wedding dress you wouldn't have a prom dress like that."
But you also wouldn't share your actual wedding dress on social media either, would you?
That's a cert way of your groom seeing your gown and surely that's bad luck?!
Perrie is currently engaged to former One Direction star Zayn Malik, after he popped the question back in August, 2013.
Since then, the pair have remarked they are "too busy" to be planning a wedding just yet and a source recently told Reveal, Perrie is refusing to set a date for their big day until Zayn starts to spend a bit more time with her.
Since the 22-year-old quit 1D earlier this year, Zayn has been in the studio working on his own material with music producer Naughty Boy.
An insider tell us: "Perrie's been really upset that, at a time when Zayn should be concentrating on their relationship for the first time ever, he's spending increasing amounts of time with Naughty Boy. She was hoping this would be their time, like he promised when he left the band."
Last week, Perrie was spotted without her engagement ring while promoting new single 'Black Magic' with her Little Mix bandmates.
Reassuring fans all is still good with herself and her hubbie-to-be, Perrie explained her rock was just being cleaned. Not before joking she had started split rumours between her and her beau!
"Tomorrow, we will probably not be together anymore! We will be separated," she laughed. "I will be heartbroken. It will be all over! I feel naked. It's horrible! I'm so used to wearing it."
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