The 22-year-old model, who married Justin Bieber for the second time in South Carolina on Sept. 30, wore a custom Off-White wedding ... custom Vera Wang slip dress for the remainder of the night.

For the occasion, the soon-to-be mom wore a dreamy ... a custom Rich & Russo silk gown and then a Vera Wang design for the reception. Related: Hailey Bieber's Wedding Dresses: All the Details ...