BRITNEY Spears little niece Maddie may soon be following in her superstar aunts famous footsteps. The 3-year-old tot - daughter of Britneys sister Jamie Lynn Spears and Casey Alridge recently tried out her own vocals in her best Britney voice and it was all caught on camera. OMG Check out my niece Maddie covering Aunt Britneys Up N Down, Britney wrote, in a message attached to the video of her niece posted on the singers YouTube account on Friday. So adorable In related Britney news, the I Wanna Go singer will soon be joined by a JoBro on her Femme Fatale Tour. This just in I will be performing at the BritneySpears concert in NJ on Aug 5, Joe Jonas who hails from New Jersey - Tweeted. And get ready for #FastLife in stores Oct. 11, he added, referencing the release date of his first solo album. Britneys latest tour is headed to South America in November, kicking off in Rio de Janeiro, Brazil on November 15. AH