The model and businesswoman celebrated the impending arrival of her baby girl alongside partner Billy Henty and their beloved dog, Astro.
It was a mini Love Island reunion, with Georgia Harrison and Olivia Hawkins joining in the fun, as well as Ferne McCann.
The chic party was held at a Mexican restaurant in Chelsea, where guests were served cocktails named Princess Paloma, Miss Margarita and Angel Fresco in honour of the baby.
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Cradling her bump, reflecting on a whirlwind year, Arabella said: "If you'd have said to me a year ago that I would be having a baby I'd have laughed in your face." Billy said: "I can't wait to be a girl dad. It's life changing. It's my own little family. Arabella's amazing. She's got a heart of gold." Billy said their little girl was "extra special" because of Arabella's struggles with Polycystic Ovary Syndrome (PCOS).
He said: "It's meant to be." Arabella said: "When I found out I was pregnant it was magical.
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With my PCOS I don't know if I'll be able to have more children so she's special.
It's hard to envisage her being here.
"Me and Billy say we'll bring her home and be like, "Now what?" Seven months pregnant, Arabella, 33, said it was all starting to feel real.
S he said: "I can't believe it's two months away. I feel like it's proper countdown time. She's moving around a lot.
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"When you see the movement, you realise there's an actual baby inside there. You feel more connected." Guests travelled from far and wide to the baby sho...