The boutique owner was pushing gorgeous Nelly in a pram through the park when she bumped into co-stars Lauren Pope and Vas J Morgan, who couldn't help but gush over the tot.
Little Nelly was wrapped up warm in a fluffy jacket and little bobble hat.
Billie has just been named 'Celebrity Mum of the Year 2015' in a poll of the public by icelolly.com. She beat the likes of Katie Price and Katie Piper to win the accolade.
Clearly thrilled, she said: "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!"
Billie and fiancé Greg Shepherd became parents to Nelly Samantha in July last year. Her middle name is after Billie's younger sister Sam Faiers.
No doubt Billie is looking forward to this weekend which will mark her first Mother's Day with Nelly.
Baby Nelly has made a handful of appearances on TOWIE, including shortly after her birth, but Billie has always said she doesn't want to completely expose her tot on TV.
"Greg and I did have the conversation whether or not to have Nelly on the show," she told Mother & Baby magazine, "but I felt like I owed it to my fans and to TOWIE. And the tweets and comments from the public have all been really nice, nothing negative – I think they just like the fact that they can see Nelly now and in a way, get to know her.
"I didn't want to be like, "I'm not having my baby on TV" because she's going to be pictured with me in lots of places so it would be silly not to have her on the show – the show is reflective of my life and Nelly is a part of my life now."
TOWIE airs Wednesdays and Sundays at 10pm on ITVBe,
All you need to know about Billie Faiers in one minute!