Looking as chic as ever, Minnies Boutique owner Billie oozed sophistication in a white blouse, tapered khaki trousers and nude heels.
Billie, Greg and Nelly were pictured at the Thomas the Tank Engine & Friends event to celebrate its 70th Anniversary at the British Museum, and they looked like doting parents as they posed with their baby girl.
Baby Nelly, who made several appearances in the last series of TOWIE, looked utterly adorable in all white.
The trio also posed with the Fat Controller from the popular TV series.
On the same day, the family also enjoyed lunch together and Billie shared a cute photo of Greg and Nelly sharing a father and daughter moment. Cute!
Captioning the snap, Billie said: "These two are so cute .. #twins... Lunch at the Rivington."
In March, Billie was named Celebrity Mum of the Year, beating off the likes of Katie Price, Frankie Bridge and Holly Willoughby.
Billie said at the time: "It's very much been a juggling act, with me trying to find the right balance between my career and family life, something I know all the real mums out there face and deserve huge credit for too - but I wouldn't change anything for the world!"
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All you need to know about TOWIE's Billie Faiers: