Yum yum yum! Justin Bieber covers the July-August issue of L'Uomo Vogue, and even with the mustache, he's still a total panty dropper!

Both Biebs and Vogue posted photos from the spread on Instagram, which was shot by Francesco Carrozzini. After modeling his undies for Calvin Klein and showing off his ripped physique on the cover of Men's Health, it's pretty fun to see the 21-year-old pop superstar all dressed up in designer duds!

And speaking of his Calvins, the Biebs made an appearance at a CK event in Hong Kong on Thursday, and not only did he delight fans with a secret performance, but he ripped off his shirt halfway through the set. In case you missed that, click HERE for some topless Bieber action!