Female celebrities often given credit to their hidden super underwear for making their rear ends look good and their stomach's smooth and flat under their unforgiving couture gowns. And more often than not, it's Spanx they claim to wear. Created by founder Sara Blakely, Spanx has just launched a line of prettier shapewear - Haute Contour - and has revealed plans to expand the brand into a full clothing line.

According to Blakely, her company has been designing prototypes in "about three categories" of apparel for "up to two years". Other than that, however, she didn't reveal much about what the products might be, or even when they'll be out on store racks.

She did say though:

"I'm very inspired to make certain articles of clothing that I won't disclose, that are in the works right now, with certain elements of Spanx hidden in them that will be fabulous," she said.

(Photo, right: Lindsay Lohan flashes her Spanx at the 2008 MTV Movie Awards.)