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Kate Upton, Katy Perry

Jonathon Ziegler/PatrickMcMullan.com/Sipa USA; Sean Gallup/Getty Images

Sports Illustrated cover model Kate Upton and pop singer Katy Perry have something in common—they want to look sexy.

And if for any reason they start to doubt whether their sex appeal is enough for the red carpet (like that would ever happen), they wear a pair of shoes that say "sex."

That should do the trick, right?

Upton rocked the $1,400 Christian Louboutin nude heels with the emblazoned "sex" on the toes last night at the Jeffrey Fashion Cares event in New York City, and paired them with a simple yet fitted LBD. However, she wasn't the first.

Perry debuted the stilettos at the Echo Awards in Berlin, Germany last week with a lavender metallic leather Paco Rabanne mini, and in reality, this would just be a coincidence, but in Hollywood, this calls for a head-to-head (or foot-to-foot) showdown.