The former Made In Chelsea star seems to have adopted a new Boston Terrier with her husband Professor Green.
Alongside a cute snap of the new pup, Millie wrote the message: "New addition to the family! Belle the boston terrier."
In the picture, Belle is seen cuddling up to a sleeping pug twice its size - too cute!
Millie and her hubby Pro Green love canines so much, it's hard to keep track of how many they actually have - but at last count there was French Bulldog Herby, Staffordshire Bull Terrier Alfie, Matilda the Doberman and two pugs!
Millie and Pro Green live together in a South East London home which must be rather chaotic at feeding time!
Earlier this week, Millie shared another snap of one of her pooches in bed with her husband of three months.
Sharing the picture of the heavily tattooed singer cuddled up with pug Martha, Millie jokingly wrote: "Get your paws off my man Martha!!"
We must admit, Martha does look a little guilty!
What do you think of Millie's new pup? Tell us below!