Britney Spears Credit:

Britney Spears is a mom again -- this time to an adorable puppy she named Hannah.

"I want you all to meet my new little baby girl @hannahspears," the X Factor judge tweeted Monday, Nov. 26, along with a photo of her nuzzling the tiny black-and-brown tyke. "How cute is she?!?!"

The answer, clearly, is "so cute." And so loved, from the looks of it. Spears, 30 -- already a doting mom to sons Sean Preston, 7, and Jayden James, 6, her children with ex-husband Kevin Federline -- has been showing off the newest addition to her family all over town.

On Nov. 19, the "Scream and Shout" singer and her family -- minus fiance Jason Trawick -- took their puppy shopping at Petco to buy pet supplies. A source tells Us the star also had Hannah in tow on the X Factor set last week.

By Monday morning, Brit's dog was so famous that it had its own Twitter account, with messages like "Woof!" and "Should I wear a bow? Mom says I'm a princess & that I need a bow."

The pup's account later retweeted Brit's welcome message, along with a note saying, "Awww, thanks, Mommy - I love you!"

To which Spears replied simply, "What a sweet little girl - love you too!"