Could there be another Spears hitting Hollywood in a few years?Britney Spears (http://www.huffingtonpost.com/news/britney-spears) showed off a video of her adorable niece, Maddie Briann Aldridge, 3, singing her song, "Up N' Down."More... (http://www.huffingtonpost.com/2011/07/30/britney-spears-niece-up-and-down_n_913951.html)