The gorgeous TOWIE star was every inch the doting mum as she cuddled her one-month-old tot and played with her at the launch of Fisher-Price's new campaign Discover Your Way.
How. Cute. Is. Nelly?!
Billie, 24, became a mum for the first time in July when she and fiancé Greg Shepherd welcomed Nelly Samantha, named after Billie's sister Sam Faiers.
Ever since, boutique owner Billie's been utterly besotted with her little one – and we can see why!
Looking as good as gold, the tiny baby posed alongside her mum for some beautiful pictures at the event. No doubt she'll be trying out plenty of Fisher-Price products as she grows from a newborn to toddler.
Billie looked very chic in her smart navy and white dress, teamed with white sandals and a glowing tan. She kept her trademark blonde hair in curls and finished her look with a red mani and, of course, that AMAZING engagement ring!
The lucky reality star received the diamond when she became engaged to her businessman fiancé Greg during a holiday to the Maldives earlier this year.
TOWIE viewers met Nelly for the first time during the just-finished twelfth series of TOWIE, where Billie was seen proudly gazing at her tot and telling her co-stars how amazing motherhood is.
"You know when people say there is no feeling like it?" she said. "There isn't! You can't explain it. I can't believe I made her. She was in my tummy. When she's asleep, I'm looking over thinking, 'When are you going to wake up?' I want to give you a cuddle."
As well as playing with Nelly at today's event, Billie chatted with other new mums at the launch of the campaign, which celebrates all the different ways children play and develop at their own pace.
The Fisher-Price campaign launches on 25 August.
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Stars who welcomed babies in 2014:
Copyright: Rex Features WENN/Matthew Taylor/Daniel Deme/Josiah True/Matthre Taylor/Joe