Put on your craziest, sexiest pair because today is National Underwear Day! Freshpair.com started the annual ode to the undergarments six years ago today and has celebrated each anniversary with runway shows, underwear model appearances on TV shows and even undie giveaways.

This year, FreshPair.com commemorates its sixth annual Underwear Day with a swank fancy underpants celebration hosted by model and magazine mogul’s granddaughter, Lydia Hearst.

Hearst isn't the only hottie to attend the event though, even retired model and Bravo’s Make Me A Supermodel host, Tyson Beckford will make an appearance at today’s event. Along with these two celebrities, 500 VIPs will accompany the pair as they watch lace and silk clad models walk down the runway in designer derriere wear. 

To check out past years' National Underwear Days, click on the video below.