"Laying here thinking how fantastic my sister @SamanthaFaiers was as one of my birthing partners I couldn't have done it without u x", wrote the new mum.
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Billie Faiers reveals sister Sam was a "fantastic" birthing partner
Billie shared her exciting baby news on Thursday of last week on Twitter.
"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," she posted.
When well wishes flooded in for the new parents, she returned to the Twittersphere to share her appreciation. "Thank you to everyone for all of the wonderful messages, I am so happy and proud of mine and @Gregshepherd_ beautiful little princess", she tweeted.
The TOWIE star welcomed a baby girl last Thursday
And it seems she is loving motherhood already, enjoying bonding time with her tiny bundle of joy.
"Having cuddles with my favourite person in the world ... xxx", she wrote at the weekend.
Billie's younger sister Sam, who used to star in the Essex-based reality TV show, has proved to be a great support throughout her pregnancy and couldn't contain her excitement as she revealed the news online ahead of Billie.
Congratulating her sibling, Sam wrote to her 1.28 million followers, "Am the proudest auntie in the whole world my baby niece is perfect. Congratulations @BillieFaiers & @Gregshepherd_."