The singer crossed the threshold over the Christmas period and the star's popularity on the service is continuing to spread.
She sits in almost 1.25 million Google + circles at the time of writing.
Google + is of course in its infancy compared to more well established social networking websites such as Facebook and Twitter.
Spears' fan base across the brands reflects that with almost 16 million people 'liking' the singer on Facebook and just over 12 million following her ...
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