Britney Spears is more famous by miles, she is the most successful female artist within the past decade and one of the most famous people in the world. To this day she has sold over 100 million records.
also britney is the biggest selling teen artist of all time, she's not a teen any more obviously. but wen he started she was. Miley has a lot of catching up to do.
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She became so trashy because she had a fight with Ashely Tisdale in public and it was all over the news papers x
I knew That Miss Mosh her Real Is Britney Marie cyrus. she is related to Miley Ray cyrus
Personally, I don't think either of them are more famous than the other
Miley Cyrus
I do hate to say it but above all Miley Cyrus has become the most popular/famous girl.