Karlie Kloss poses in her underwear as she excitedly unveils new Calvin Klein collaboration... after landing cover of Forbes 30 Under 30

 Golden girl Karlie Kloss poses in her underwear for a new collaboration between Calvin Klein and Amazon Fashion.

The 25-year-old model sports a black bra and matching boy shorts in a snap she shared with her Instagram followers on Today.

Karlie captioned the image: 'Over the moon to be in #mycalvins for this very special fashionXtech collaboration between two of my faves @calvinklein + @amazonfashion'

She's a world-renowed supermodel and she recently graced the cover of Forbes' '30 Under 30' edition; not bad, huh? We are, of course, talking about Karlie Kloss...

Post-Forbes cover, the Victoria's Secret model and founder of Kode with Klossy shared a photo to her Instagram of her clad in nothing but Calvin Klein undies.

When it comes to gym kit staples you can't beat a good sports bra and this Calvin Klein one is the ultimate classic. What's more, with its monochrome colourway it's super versatile and will slide right into your workout wardrobe.

The Calvin Klein and Amazon Fashion retail experience was unveiled on today and will be available until December 31.

According to a press release, it will include pop-up shops with exclusive styles available only to Amazon customers in New York City and Los Angeles as well as an online brand store.