The Hollywood couple announced their engagement last August after 15 months of dating, however they reportedly put their wedding on hold this past May and have only occasionally been seen together in public since.
E! News ran photographs of the "Wanderlust" co-stars looking happy and relaxed while shopping during the July 4 holiday weekend.
Theroux, 41, and Aniston, 44, visited home decor and clothing stores during the excursion, E! News said.
The couple recently renovated their 8,000-square-foot mansion in Bel-Air, Calif.