Reveal broke the news this afternoon (10 July) that Billie had given birth to her daughter - her first child - and now she has spoken for the first time.
Taking to Twitter, new mum Billie gushed: "We are so excited to announce the birth of our beautiful baby girl.
"We are so happy and the proudest mummy and daddy in the world!"
Billie's sister Sam, who is now an auntie, also tweeted: "Am the proudest auntie in the whole world my baby niece is perfect. Congratulations @BillieFaiers & @Gregshepherd_!"
As TOWIE fans will know, Billie had been waiting anxiously for the arrival of her baby after going overdue but finally things got a wriggle on today!
Billie announced her pregnancy back in January, and then revealed the baby's sex during a party aired on TOWIE.
She and Greg broke the news to friends and family by cutting into a pink cake, showing it would be a baby girl.
It was a doubly joyous start to the year for Billie, as shortly after her pregnancy was announced, she became engaged to Greg. He proposed to her during a romantic holiday in the Maldives at the start of the year.
TOWIE stars congratulate Billie and Greg: