In all honesty, Billie looked pretty fabulous from head-to-toe, but when she Instagrammed a close-up picture of her make-up? Well, hell-o!
Billie rocked up for the party in full-on punk attire, along with ear cuffs, choker, a tie-dyed tee, ripped hot pants and over-the-knee boots.
With her hair slicked back into a backcombed quiff she totally looked the part, as did all the TOWIE ladies who we spied arriving at the Sunday (10 April) do – yes, we're talking to you Kate Wright, Chloe Lewis, Megan McKenna and Danielle Armstrong...
And the icing on the cake where Billie was concerned was her fierce make-up, which was created by celebrity make-up artist Jess Unsworth who also works with Billie's sister, Sam and TV presenter Katie Piper to name just a few.
Jess gave Billie a seriously sizzling look which was the perfect blend of rock-chick and sex-kitten.
Strong brows? Tick. Super-dark, flicked eye make-up? Check. Chiselled cheekbones and flawless foundation? Done.
But what we love most about this look is Billie's glossy, blood-red lips. As one of her Insta followers quite aptly posted: "Those lips are everything!!"
Indeed they are.
It looks, to us, like Jess gave Billie's pout an almost-ombre look, with a deeper red shade at the corners, going lighter towards the middle of her lips.
Worn on and off on the catwalk for a few years now, ombre lips are certainly not for the faint-hearted. But they look uh-mazing, so here's how to try them at home:
1. First line your lips with a nude pencil to avoid feathering and help your lip colours stay put. We love Smashbox The Nude Lip Pencil, £13, boots.com.
2. Grab a lip brush and apply a darkish red colour around the outside of your lips and towards the outer corners. Try L'Oréal Paris Colour Riche Collection Exclusive by Eva, £6.99, boots.com.
3. Next, apply a lighter red towards the centre of your lip. We love NARS Semi-Matte Lipstick in Heat Wave, £21, narscosmetics.co.uk. Blend the two shades together with your brush, then smudge your lips together for a seamless finish.
4. Pop a clear gloss like Elizabeth Arden Crystal Clear Lip Gloss, £17, boots.com over the top and you're done.
PS: If the idea of attempting ombre lips has you in a minor meltdown, stick with a highly-pigmented, red lipgloss instead and apply this all over. Urban Decay High Colour Lipgloss in No. 69, £15, debenhams.com is always a winner.
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