The blonde boutique owner and fiancé Greg Shepherd are said to have welcomed their first child together today (10 July), however there is no word yet on their daughter's name.
In a statement, Billie's rep told Reveal: "We would like to announce our client Billie Faiers has given birth to a baby girl. Mother and baby are doing well."
Billie is the first TOWIE star to give birth and have a pregnancy storyline on the show, although co-stars Chloe Sims, Elliott Wright and Dan Osborne are all parents.
Because of her pregnancy, Billie was not out in Marbella with the rest of the TOWIE cast, who were filming scenes for the twelfth series opener in June.
Instead, Billie was basking in the sunshine in her own garden and getting ready for the baby by finishing her nursery and stocking the wardrobe.
There's no doubt Billie's baby will be one of the best dressed celebrity kids around!
For the last two weeks, Billie has appeared in TOWIE and told her pals how excited she was about "meeting her daughter". And after going overdue, it seems she finally has. Hooray!
Billie announced her pregnancy back in January, then revealed the baby's sex during a party aired on TOWIE. She broke the news to friends and family by cutting into a pink cake, showing it would be a baby girl. Creative!
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.
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TOWIE stars congratulate Billie and Greg: