Looks like corsets aren't the only body-cinchers getting a star-studded boost.
Slimming shapewear garments have seen a 10.6 percent increase in annual retail sales from March 2009 to February 2010, plus a 3.8 increase in unit sales according to figures from The NPD Group.
And it looks like Spanx might want to send a Hallmark card to Hollywood as a show of gratitude.
Celebrity Spanx devotees like Gwyneth Paltrow, Oprah Winfrey and Jessica Alba have reportedly sparked a rise in the popularity of shapewear, while corset and garter-loving gals like Lady Gaga and Beyonce have also gotten shoppers' knickers in a twist.
"We started seeing this happening about two years ago with red carpet-ready celebrities saying, 'I've got my Spanx on,'" Maureen Stabneau, senior vice president of merchandising for BareNecessities.com, told WWD.
"It also became a secret weapon for celebrity stylists, and shapewear came out of the closet," she said. "Our shapewear business is doing very well, and our plus-size shapewear business is ahead by 25 to 30 percent over the past year. It's not necessarily about being smaller; it's about making you look smooth."
According to the NPD, shapewear in sizes XL-XXXL and up saw a sales growth of 14.8 percent.
"There has to be something of a fashion authority, something that shows people looking good in what they're wearing, whether it's prime time TV, a fashion show in Paris or an ad in Vogue.
"As brilliant as 'Mad Men' is about Americans in the early Sixties -- the show makes old Fifties girdles look so fabulous under clothing -- it's more brilliant as an ad for undergarments."
Meanwhile, check out hot shapewear trends for Spring 2010.