Britney Spears is such a doll ... literally! Check out her customized Russian Babushka doll ... with her Circus image on the front.

The 29-year-old pop star, who's currently performing in Russia, Tweeted the above photo and the following:

    "How cool is this?! Had a great time in Russia - amazing start to 2nd leg of the Femme Fatale Tour."

In case you're not familiar with a Babushka doll, it's a set of wooden dolls of decreasing size placed one inside the other.

Everyone around the world loves Britney!