The pair - who've been best friends since way before they both joined The Only Way Is Essex - dressed up for their mutual friend's birthday.
Posing alongside the birthday girl, Abbie, Billie and Ferne posed for an Instagram selfie, with Ferne captioning the glam shot: "Out with my favourites for our girls 30th @abbiewalkerdavy
"This weather though. Happy Saturday lovers."
Billie later regrammed the snap and wrote: "Loving my Saturday with all my chicas for Abs 30th #regram #selfie."
In another Instagram picture, the girls can be seen posing with their glam group of friends in the sunny restaurant.
Alongside the happy snap, Ferne wrote: "So happy to be out all day with my best friends."
While Billie, 26, is still a TOWIE regular, Ferne, 25, quit the show before the latest series in February, following her stint in the Australian jungle for I'm A Celebrity... Get Me Out of Here.
So it's nice to see the pair reunited on their home turf of Essex.
Making the most of Britain's current heatwave, Ferne wore a strappy crochet cream top for the lunch, finished off her look with an on-trend choker.
Billie wore a low-cut navy blue dress and gorgeous oversized shades.
The day before the birthday lunch, Ferne shared a picture of her looking utterly sensational in a plunging black playsuit, captioning the image: "I got that FRIYAY feeling."
And Billie - who is mum to one-year-old Nellie - showed off her unbelievable figure in a bright orange bikini on Instagram.