The stunning blonde let the name slip during a chat with fellow cast members Ferne McCann and Gemma Collins, however Gemma began to cry as she talked about ex-boyfriend James Argent having spent the night with Lydia Bright.
Baby Nelly made her television debut during an episode of TOWIE
"Come on, Nelly doesn't want to see you upset," said Billie, revealing her daughter's name as she comforted her friend. After the episode aired, the new mum took to Twitter to reveal her excitement at seeing her baby girl on screen.
Billie's sister Sam also took to Twitter as fans shared their excitement about finding out Nelly's name. "Oh you're famous little niece," she tweeted. "Auntie is so proud of u xxx."
Lydia's Mum Debbie, who has previously appeared in the series, also welcomed the reality show's latest addition. "Welcome to Towie NELLIE @BillieFaiers #adorable," she tweeted.
Billie revealed Nelly's name during a TOWIE episode
During the scene, Billie was wearing a lilac lace dress, which she had shared on Instagram,marking her first outing with her baby daughter, although she did not mention whether it was for filming.
Billie had previously shared a photo of her lilac dress on Instagram
The reality TV star announced Nelly's birth on 10 July, sharing her excitement with fans on Twitter. "We are so excited to announce the birth of our beautiful baby girl," she wrote. "We are so happy and the proudest mummy and daddy in the world." Billie also revealed that her sister Sam had been supporting her all the way.
"Laying here thinking how fantastic my sister @SamanthaFaiers was as one of my birthing partners I couldn't have done it without u x" she wrote.
Sam's support for her sister was evident as she couldn't contain her excitement and revealed the news that Nelly had been born ahead of Billie. Congratulating her sibling, Sam wrote to her 1.28 million followers, "Am the proudest auntie in the whole world," she wrote to her 1.28 million followers. "My baby niece is perfect. Congratulations @BillieFaiers & @Gregshepherd_."