Oh come on - it's never too early to plan ahead!
The reality star - who has her very own fashion collection with online style hub Miiaan - channelled her inner flapper girl as she stepped out in this stunning dove grey dress that boasted lashings of beaded flowers, tiny spaghetti straps, and a cutesy feathered hem which drew attention to her long legs.
Now, even though Zara loves a good designer buy, she took to Instagram to reveal that she actually nabbed her frock from none other than Little Black Dress (Alesha Dixon is also a huge fan).
The blonde beauty teamed her affordable party look with her failsafe Louboutin heels, nude obviously, and a glittery shoulder bag to boot.
Zara took a bit of a risk when it came to her make-up, opting for a wash of fuchsia eyeshadow, which she blended right up to her brow bone, and a matching, ultra-glossy lip.
Of course, said risk totally paid off, and she trumped more or less every other guest in the beauty stakes - oh, we went there!
Zara was joined by the likes of Charlotte Crosby, Holly Hagan, Courtney Green, and Chloe Meadows to name but a few celebs.
Earlier this year, the former Miss Great Britain got real honest about her (fabulous, just saying) figure and she had a little message for the bodyshamers!
"There is a lot of a pressure to look great," Zara told us, "but at the same time, I am just a normal 21-year-old girl who is super happy!"
"I'm so busy at the moment I'm finding it hard to fit the gym and eat healthily. I have the biggest sweet tooth in the world," she said, "and I eat so much chocolate, and cocktails are a nightmare!"
But she won't let the negative comments get to her - oh no.
"So what?!" Zara continued, "I'll breathe in a bit. I'll buy a pair of Spanx if it comes to it. Jesus."
You tell 'em, girly.
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