TOWIE star Tommy told fans his upsetting news earlier today (15 August), having previously asked people to pray for his sick pooch.
Posting a lovely picture of Buster chewing a trainer, he wrote on Instagram: "Rest in peace my brother Buster.. I love you to bits boy!!! Thank you to everyone for praying for him!! Love this photo of him, he never played with toys he only had shoes in he's mouth.. Thanks for the best 11 years."
Tommy's girlfriend, Georgia Kousoulou, also tweeted: "I hope your in peace now my boy, I will never forget & stop loving you.. Thank you for the love you gave us all. Sleep tight buster x Thank you everyone for all the support & kind words to Tom & family x."
This is the second tragedy of its kind to rock the TOWIE cast in recent weeks. Last month, Bobby Norris revealed his beloved dog Beau had died after being attacked by a bigger mutt during a walk.
Following Beau's death, Bobby got a tattoo to remember him by and held a party to celebrate his life with his co-stars.
Last night, Bobby introduced his new dog Baby to his friends during an episode of TOWIE.
The current series of TOWIE concludes on Wednesday night with a circus-themed finale episode.