The Marry Me star accessorized with a single necklace, earrings and a stylish pair of sunglasses, and she kept a dark brown handbag slung with her as she spent time in public.
The loved-up pair opted for some healthy choices as they were seen picking up green smoothies with Kourtney's youngest son Reign, seven.
The 52-year-old hitmaker cut a casual figure in a stripped-down outfit while she spent some quality time with her daughter Emme and son Maximilian, both 13.
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Ever the gentleman, he opened up the car door for his soon-to-be wife and waited until she was safely in before closing it behind her.
Quality time: Jennifer Lopez was seen taking her kids out to brunch in Los Angeles on Saturday afternoon The On The Floor singer also rocked a tight-fitting pair of dark gray pants that clung closely to her curvaceous figure.
Inside information: A source recently spoke to Entertainment Tonight and told the media outlet that Lopez and Affleck, 49, was looking forward to their future as a couple The source also pointed out that Lopez and Affleck may take their romance to the next level in the near future.
Lopez sported a low-cut white T-shirt that showed off her toned arms during her outing with her children.