No bra is that magical.
No he's right, my girl has a bra like it, as well. Our friend who's three cup sizes larger didn't believe my gf's weren't bigger than hers until she saw them out of the bra. If you look you can see the bottom curve of her breasts. Most likely the bottom of the bra to about 2in above it is just padding. They're still big, but not nearly as big as they're made to appear.