Article continues below advertisementKarlie Kloss is ready to pop!The mom-to-be, 33, flaunted her baby bump in a black bra and underwear on Tuesday, September 2. Kloss caressed her stomach as she snapped a mirror selfie, sans makeup, with her hair swept into a messy bun.Article continues below advertisementSource: @karliekloss/InstagramKarlie Kloss is nearing her pregnancy due date.In a similar selfie, she tied her hair up in a towel - seemingly fresh out of the shower - and got cozy in black sweatpants.