In fact, the reality TV stars and good friends swapped hairstyles for the occasion!
Deciding to stay in on Saturday night (25 October) for a "wig party", the girls got snap-happy as they had some laughs with wigs and wine - sounds like a fun combo to us!
While Billie wore an auburn-coloured bobbed hairpiece, Ferne took inspiration from Billie's usual colour - platinum blonde.
Sharing a selfie on her official Instagram account, Billie wrote: "Ooooooo so we #switched."
And we have to admit, they both suit their new looks!
Sister Sam was also at the wig party and tweeted: "Night in with my girls."
But no TOWIE girls' night in would be complete without party-loving Harry Derbidge!
The joker, who split up with boyfriend Bobby Norris earlier this year, chose to wear a Bon Jovi-esque brunette number which made him almost unrecognisable!
Proving that you don't have to leave your house to have a good time, Billie made sure she looked her usual stunning self for the night in.
As well as the sleek wig, she also got an ornate henna tattoo on her hand for the occasion.
Before the festivities began, Billie shared a picture of the beautiful silver pattern snaking up her arm.
New-mum Billie wrote: "Amazing #glitter #henna …"
We love it!
Staying in never looked so much fun - can we be invited next time?
Do you like Billie Faiers and Ferne McCann's new looks? Tell us in the comment box below and you could win £50!
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