Talk about putting it all out there!

On Monday night at the Jeffrey Fashion Cares event in NYC, Kate Upton worked Christian Louboutin's boldest footwear yet: nude heels with the word "SEX" emblazoned across the toes.

The Sports Illustrated swimsuit model's dress was boring in comparison: a plain black dress with 3/4-length sleeves that was figure-hugging but not skin-tight.

PHOTOS: Kate Upton's hot body moments

The sexy shoes were first seen on the feet of Katy Perry last week in Berlin, Germany when she stepped out on the Echo Awards red carpet. She teamed the nude patent peep-toe heels with a lavender metallic leather Paco Rabanne mini.

PHOTOS: Stars' sexiest, craziest shoes

The 4.7-inch high red-soled stilettos are part of the famous shoemaker's Spring/Summer 2012 collection and retail for $1,395. They're also available in shiny black patent leather.

Get more Us! Follow us on Twitter, Friend us on Facebook, Subscribe to Us Weekly