Jennifer Garner enjoys mother-son time with her and Ben Affleck's youngest child Samuel, 12, while grocery shopping in Los Angeles

Jennifer Garner enjoyed a mother-son outing with her and Ben Affleck 's youngest child Samuel on Sunday.

The 52-year-old actress had a big smile on her face as she ran errands with her 12-year-old son in Los Angeles .

She was seen after loading up her car with groceries and pushing the shopping cart back alongside her son.

For their outing, the 13 Going On 30 star — who looked phenomenal as she stepped out in a black, velvet corset dress during Paris Fashion Week — looked effortlessly stylish in jeans and sneakers.

Similarly, her son Samuel also dressed casually and comfortably in a graphic T-shirt and plaid pants.

Garner looked chic as she went for a monochromatic, black-and-white ensemble teamed with medium-wash mom jeans.

She sported a striped T-shirt, which she layered underneath a cozy, knit cardigan.

She also sported black, gray and white sneakers to match her look.

The mother-of-three threw up her brunette tresses into a messy ponytail and threw on a pair of sunglasses as she ran errands with her son.

She accessorized with dangling pearl earrings and had her hands full with her car keys and other necessities.

She also appeared to have a loaf of bread under her arm, at one point.

In addition to Samuel, Garner and her ex-husband, who were married for 10 years before divorcing in 2018, are parents to Violet, 18, and Fin, 15.

Her outing comes after a new report emerged earlier this month about her long-term relationship with John Miller, 46.

'She loves [Miller],' a source told People, adding that the pair spent this weekend together as her ex-husband Ben Affleck, 52, cared for their youngest two kids while while their oldest, Violet, 18, is away studying at Yale University.

'They are serious. He's also a co-parent and understands her priority,' the insider shared.

'Their relationship is fun and easy-going,' the source added. 'She's very happy.'

Miller is an attorney and is currently serving as the CEO of CaliBurger and its parent company CaliGroup.