Yesterday, the couple took Nelly into central London before enjoying a pre-Christmas afternoon tea at exclusive department store Harrods, based in Knightsbridge.
Billie dressed their baby girl up for the special outing, opting for a cream frock, cardigan and tights, and shared a picture with fans before they set off.
Commenting on the Instagram snap, Billie said: "All ready for a day in london with mummy and daddy ... #Christmas."
Later on in the day, Billie took a picture of the menu for Harrods' Tea Room, adding: "Afternoon tea with Greg and our little doodles ... #harrods." What a treat!
TOWIE star Billie gave birth to Nelly in July and the tot has already experienced some pretty special holidays and trips out. Last month, Nelly joined her mummy, aunty Sam and grandma on a girls' holiday in Dubai and enjoyed her first ever ride on a yacht.
Meanwhile, Nelly is already a little star in the making, having appeared alongside her mum Billie in TOWIE a handful of times since her birth.
Earlier this month, Billie spoke to Reveal about motherhood and opened up about her plans for Christmas.
"It's Nelly's first Christmas so I'm very excited," she said. "It's so much more fun when there's babies around.
"I know when I was younger at Christmas, Samantha and I used to get so excited, I think Nelly will be the same."
Celebrities who have given birth in 2014:
Copyright: Rex Features WENN/Matthew Taylor/Daniel Deme/Josiah True/Matthre Taylor/Joe