The popstar tweeted a picture of herself with puppy Hannah earlier today with the caption: "I want you all to meet my new little baby girl @hannahspears < 3 How cute is she?!?!"
The canine already has her own Twitter account, with an avatar that features the pair together and a bio that says simply: "I'm Britney's Bitch".
Hannah's first tweets were: "Woof!" and "Should I wear a bow? Mum says I'm a princess & that I need a bow."
Spears features on will.i.am's new single 'Scream and Shout', which is set for a video debut this Wednesday (November 28) on The X Factor USA.
will.i.am said the track is "the most exciting that I've worked on in a long time".
Watch a video preview of 'Scream and Shout' below: