Kourtney Kardashian steps out in cleavage-baring lacy black top

Kourtney Kardashian displayed a bit of her trim midriff as she stepped out in Calabasas on Friday in a slinky black sleeveless top.

The 38-year-old mother-of-three had slicked her hair back and wound it into a ponytail, letting a casually-slung-on white jacket slide off her shoulders.