Who said "I did it again"?

This quote is attributed to Britney Spears.

I did it again - Britney Spears

"I did it again"

Britney Spears

Pop Singer Dancer American Born 1981 (age 45)

"I'm not a girl, not yet a woman"

"You want a piece of me"

"Oops, I think I made a mistake"

"Hit me baby one more time"