Jennifer Garner has been pictured wearing a sparking diamond ring following her ex-husband Ben Affleck's wedding to Jennifer Lopez.READ: Jennifer Garner sends emotional message to 'frenemy' after Ben Affleck weds Jennifer LopezThe 50-year-old stepped out near her LA home on Tuesday wearing an off-duty outfit consisting of a black pleated skirt and beige cardigan – but it was her jewelry that stole the show, with the sparkler reported to be an eternity band given to her by her boyfriend John Miller.WATCH: Jennifer Garner sparks engagement claims with telling new jewelryJennifer has been dating businessman John since 2018 after her divorce from Ben was finalized. They briefly split in October 2020 before rekindling their romance earlier in 2021.The 13 Going on 30 actress and father-of-two John have never commented publicly on their relationship, but her former Alias co-star Victor Garber – who married Jen and Ben back in 2005 – shared his opinion on her relationship.MORE: Jennifer Garner and boyfriend John Miller make rare outing togetherMORE: Jennifer Garner shares rare glimpse inside home life with her three children"I have [met him].