Well, we all suspected it, didn't we?
Turns out that Britney has had a boob job - but that she undid that boob job when it didn't turn out quite how she expected.
Although she did have a breast enlargement in 1999, a source says that she immediately regretted it:
“[Britney] regretted the implants almost immediately, particularly because her chest was still growing.”
“And when her natural breasts became larger, she had the implants removed.”
“When other girls did their boobs [they admitted it] and moved on, but Britney was brought up to lie about herself.”
Whatever. Turns out that her boob size is the least of her concerns.