That's hilarious, because the two pics of the same dress are taken like... what, 2 days apart, at the Brits and that fashion show. It's a miracle!.
Take the picture on the right, from the Brit awards, and compare it to other pics from the same night.
Not nearly as big/full as the pic in the example.
And compare it to these:
Taken 7 days earlier, obviously pushed up or taped:
5 and 6 days before the Brits:
If you do a google search (with SafeSearch off) you can see lots of pics of her bare breasts to compare, and older candids as well. She may have gotten small implants, but if she did it was a long time ago.