"The Mummy Diaries" has been renewed for two more years.
Sam and Billie Faiers" reality TV show, which follows their lives since having children, has been such a hit with viewers that ITVBe has signed the siblings to a huge deal which will keep them on the air until 2021.
A source told MailOnline: "ITV have recommissioned "The Mummy Diaries" until at least 2021 in a mega bucks deal for the girls."
The upcoming final episode of the current series will air next week, showing Billie and her husband Greg Shepherd's recent nuptials in the Maldives.
Sam's experience as a first-time mum was first documented in 2014 with one-off series "Sam Faiers: The Baby Diaries".
ITV then commissioned "The Mummy Diaries" in 2016, which Billie appeared on as a guest before she joined the show permanently in 2017.
Speaking about the decision to add Billie permanently, a show source said at the time: "Sam will be joined by her sister Billie in the new series of the "Mummy Diaries".
"There will be a Kardashians flavour to it this time - two sisters bringing up their broods and all the challenges and adventures they get up to together as a family.
"Billie has a great sense of humour and fans of "The Mummy Diaries" saw her baby boy Arthur moments after being born and hilarious scenes of her trying to sleep train her daughter Nellie.
"Sam and Billie are extremely close and their onscreen chemistry is fantastic, the girls were only too happy to star together and make it more about the Faiers family as a whole."
Billie and Greg have children Nellie and Arthur together, while Sam and her partner Paul Knightley are parents to Paul Jr and Rosie.