Her male model friend is advertising Givenchy jeans, and Shayk, who turned 30 this month in a steamy way, seems to be advertising (err, or at least advocating) bare skin caressing said jeans.
Here’s the Instagram photo in all its black-and-white glory:
And just in case the Instagram censors pull it, here’s the same photo (in case you wanted to ogle again).
Oh yeah, fellas. Hot stuff, here.