Kunis -- who is pregnant with her and Kutcher's second child -- wore a black-and-white striped Envie de Fraise maxi dress and flip flops. The 33-year-old actress kept the rest of her look simple, sporting minimal makeup and her natural brunette tresses.
Kutcher, 38, also opted for a cool and casual vibe, donning a gray baseball tee, which he paired with gray slacks, sneakers and a matching baseball cap. An eyewitness tells ET that at one point, Kutcher opened the car door for Kunis. "They were chatting and seemed happy," the eyewitness added.
Back in June, Kunis' rep confirmed to ET that the adorable duo were expecting baby No. 2 -- the two are already parents to 1-year-old daughter Wyatt Isabelle.
During an interview with On Air with Ryan Seacrest one month later, Kunis revealed she and Kutcher are already thinking about expanding their family.
"After we had Wyatt, the second I gave birth, I knew we had to have another baby," she explained. "We both knew it, we just felt it."
"And so I always say after the second one, we'll know if we need to have another one," she continued. "I really do believe you know when your family is complete."
Kutcher and Kunis met nearly two decades ago on the set of That '70s Show. They began dating in 2014, and secretly tied the knot in an intimate ceremony at the Parrish Pioneer Ranch in Oak Glen, California, on July 4, 2015.