Britney Spears was back on top this year — she spent most of the months on her worldwide Circus tour including her first ever shows in Australia to finish it off! She also slowly gained more and more custody of her sons Sean Preston and Jayden James with Kevin Federline along for the ride some of the time. Britney also got closer with her boyfriend and agent Jason Trawick which included lots of romantic and family bikini time. Take a look back at some of the year's most memorable Britney moments and check out the rest of our Best of 2009 slideshows and polls here.
Best of 2009: Britney's Worldwide Circus and Happy Family
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