The celebrity couple was spotted leaving Ralph's supermarket in Sherman where they bought a good haul of items for the big event this weekend.
The two appeared to be in great spirits as they walked with Gwen's son Apollo, two.
The pop star donned a blue shirt with a sports jacket that had some fluffy fur around the collar.
She stayed in touch with her usual spunky style with a jean skirt and black tights.
Gwen added on a pair on tall brown boots as she held her child's hand in the parking lot.