Greg spoke out this evening after Reveal broke the news that he and Billie had welcomed their little girl into the world earlier today.
Taking to Twitter, proud dad Greg gushed: "So proud to announce the birth of my beautiful baby girl. @BillieFaiers was amazing love you both so much #babyshep." Aww, too cute!
Meanwhile, Billie has also tweeted about becoming a mum, saying that she and Greg are the "proudest" parents ever.
Billie tweeted: "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!"
First-time mum Billie had been waiting anxiously for the arrival of her baby after going overdue by several days, but she finally made an appearance today.
Sister and former TOWIE co-star Sam tweeted her excitement earlier. She said: "Am the proudest auntie in the whole world my baby niece is perfect. Congratulations @BillieFaiers & @Gregshepherd_!"
Billie announced her pregnancy in January, and then revealed their baby's sex during a special party aired on TOWIE.
During the bash, 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: