Kristin Cavallari looks great in this vest!
The Life & Style site doesn't say whether her vest is real of faux, but you can definitely find beautiful faux alternatives. Kristin's looks like she might be wearing shearling or something like it. The vest is great on her though, and she definitely pulls off the sleeveless look very well.
Life & Style suggests two designers that are currently offering great variations vest options this fall/winter.
Left: Stefani Greensfield $150 - HSN.com
Right: Rachel Zoe for QVC $80 - QVC.com