I could be wrong but these look like the L.A.M.B Trina pumps.
Love this pic. Makes me want to buy a sexy new pair of shoes, make up my bed in white, grab that stray cat that keeps wandering into my backyard and snap my own cute pic.
Here's a size 8.5 L.A.M.B Trina pump available for sale at heels.com. This one's got a bit of a different heel and is a mix of leather and suede where the one featured in the Instagram pic above looks to be 100% leather all over.