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The Pop Princess (and birthday girl!) discussed her Planet Hollywood gig with Ryan Seacrest during an iHeart radio album preview for Britney Jean (which drops tomorrow) today.
"There's a lot of different, interesting aspects to the show and a lot of moments where the audience feels like they're in the show with us. A lot of special effects like that and it's the most dancing I've ever done," Spears said.
Yay! We love dance-break-Britney!