Post Malone opened up about making his underwear campaign debut with the Kim Kardashian apparel brand and the surprising way he prepared for the NSFW shoot.

Along with other new lounge pieces, the campaign features the Heavyweight Fleece Jogger, Zip-Up Hoodie, and SKIMS Basics T-Shirt.

The musician stripped down to his Realtree-camo-print skivvies and opened up to GQ about touring, life in Utah, and fatherhood. “It’s badass to be a dad,” he says. “It’s the most beautiful thing I’ve ever experienced.