Britney -- Abs-olutely Perfect
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What Britney lacked in dance moves on "Good Morning America," she definitely made up for in the ab department.
Spears brought her now infamous "Womanizer" strutting/arm-flailing routine to a new song, "Circus" but her stomach made for quite the distraction.
Another welcome distraction -- the birthday girl's fam, who sat in the second row.