"I did not have implants, I just had a growth spurt"

Britney Spears is referring to her physical change from a girl to a girl. She is stating that her body altered naturally, with no medical intervention. She experienced a growth spurt, which is a duration of rapid physical growth that usually happens throughout puberty. Throughout this time, her body altered fit and size, and she established curves. This is a common experience for many young people, and it is a natural part of maturing. Britney Spears is highlighting that her improvement was not due to any artificial ways, such as implants, but rather due to her body's natural advancement. This quote is a tip that physical changes are a regular part of growing up, and that we must accept and commemorate our bodies.