The waist trainer's No. 1 fan, Kim Kardashian, has taken her love to the streets. Kim donned head-to-toe black while out in L.A. yesterday, completing the look with a leather waist trainer (or "corset," if you're fancy) over her shirt.

The Kardashians love a good waist trainer and will defend them until their dying day. Whether they're working out, filming a music video with Fergie, or posting selfies to Instagram, it's always the right time to physically force their waists to shrink.

This further proves that Kim is the ultimate multitasker, always mixing practicality and fashion. And people wonder why she's on the cover of Forbes.