Jessica Simpson isn't flaunting her famous curves in the new ad campaign for her Jessica Simpson 2014 Collection -- the 33-year-old new, second-time mom is showing of a more svelte look in these sexy bathing suit pix.

Yes, she's still got her famous D-cups but the curvy hips and bodacious bod she used to have seems absent in these new modeling shots for her Spring-Summer collection.

An old Hollywood glam, white bathing suit seems to mask her usual hourglass figure ... and to what does she attribute this dramatic weight loss? To Weight Watchers, of course! A WW spokesperson, Simpson says the weight-loss program helped her lose weight after the births of her two children - Maxwell Drew, 20 months; and Ace Knute, seven months.

Still, we know the second-time mom has been successful in dropping the pounds, but do you think there's any Photoshopping going on here? Or maybe a corset, perhaps?