If she wanted bigger boobs, she has the money to buy them. Her detractors could then have reason to feel she's sold out
But advertisers fake images all the time. Commercials are fantasy films and if you read the small print on any advert in magazines or on TV, you'll usually see a line that explains away the magic.
From Penelope Cruz promoting thickening mascara - when she was in fact wearing false eyelashes - to models sporting weaves and hair extensions when they're selling shampoo, cosmetic companies are no strangers to faking it.