Trey Songz stripped down to his underwear on Instagram on Monday and showed the ladies what he’s working with. He shared the sexy pics taken in the bathroom and wrote “Thanks Calvin Klein for the delivery #MyCalvins”. After he posted this, girls went crazy and it became a trending topic on Twitter and instagram. But it later turned out to be a subtle ad for Calvin Klein. The clothing giant enlisted him and a few other celebs to show off their underwear on their social media pages.