updated 10/14/2013 AT 1:00 PM ET
•originally published 10/14/2013 AT 1:30 PM ET
Jessica Simpson sure can rock a bridesmaid dress.
The mom of two – she and fiancé Eric Johnson welcomed son Ace Knute June 30 – walked down the aisle in publicist Lauren Auslander’s wedding on Friday in Newport, Rhode Island.
If the bridesmaid look seems a bit familiar for Simpson, 33, it should she was maid of honor for best friend CaCee Cobb in December.
Wrote Simpson: “Beautiful morning with my future mother-in-law and MoJo to my babies.”
No final word yet on when she and Johnson will make it official!