Every woman's best-kept secret is about to get a little more popular, as undergarment guru Sara Blakely, 41, opened the first Spanx store in the Tysons Corner Center shopping mall in McLean, Va., a suburb of Washington, D.C.

Blakely was present at the location along with Spanx CEO Laurie Ann Goldman this morning to celebrate the opening with a bottle of champagne.

"This is the first ever store," said Blakely, who Forbes magazine reports as being worth somewhere in the neighborhood of $1 billion, according to USA Today. "It's one of those things that I just can't believe it's actually happening. I remember the days of working so hard to get a pocket — not even a row but a pocket — in a hosiery department."

And the new Spanx store is in a lucky location, too. "After we signed the lease, we found out it was the location of the very first Apple store," Blakely said. "We've had people tell us we're the Apple of shapewear and undergarments."

And the stars agree. Blakely credits Oprah Winfrey, Gwyneth Paltrow, Jessica Alba and the Kardashians with being "the most vocal" celebs who have endorsed Spanx and talked about using them. Jennifer Garner and Katy Perry are also big fans, according to the paper. And for anyone who ever erroneously thought that Spanx were just for chicks, Modern Family's Jesse Tyler Ferguson is also a fan, as he showed off in a WhoSay pic of him in his underwear on the day of the Emmys.

Blakely will be opening up two more stores in the next few weeks.

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