When Did THIS Happen????

Holy boobies, Batman!
When did Hilary Duff grow such huge tatas????
The Duffster was practically spilling out of her dress at the 2007 Spirit of Life Dinner in LA on Thursday night.
Here she is posing with self-proclaimed virgin until marriage, Miley Cyrus, and her dad, Billy Ray.
That must be an amazing push-up bra!
We don’t think Hil got a boob job. Do U???
[Photo via Getty Images.]