The pair were spotted going to dinner with the Saturday Night Live producer's parents at Cassia, an upscale Southeast Asian restaurant in Santa Monica, California, on Saturday.
The Justice League star looked fit and stylishly scruffy, while rocking a black and red leather jacket over a black shirt, denim jeans and converse sneakers.
Meanwhile, Shookus looked chic in a casual yet classy ensemble consisting of a light peach-colored sweater and some ripped-at-the-knees jeans, which she paired with white heels.
As for her parents, they dressed like everyone's parents have always dressed to have dinner with their adult daughter's boyfriend while visiting from out-of-state: Her dad, Robert, wore a light button-down shirt, no tie, with a dark blazer and jeans, while her mom wore various shades of tan layers with some fancy embellishments.
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Ben Affleck and Lindsay Shookus Are 'Going Strong' (Exclusive)
"Lindsay and Ben are very much in love," a source recently told ET. "During Ben and Jennifer's split, Lindsay truly felt villainized. Every day she spent with Ben out in the world for people to see felt like another day of public scrutiny, but her love for Ben was worth it. They both learned to stick by each other during those painful months."
The source added that Affleck, who has publicly dealt with her sobriety battle over the last few years, has been working "incredibly hard" on overcoming his vices that Shookus "has been his rock."
As for Affleck and Garner, the pair have been very amiable following their split, and have worked hard at seamlessly co-parenting their three kids -- 12-year-old daughter Violet, 9-year-old daughter Seraphina, and 6-year-old son, Samuel.