The expecting duo matched in royal blue ensembles while they carried bouquets of flowers during a shopping trip in Los Angeles.
Kutcher's sister opted for a loose-fitting blue maxi dress while Kunis kept it cool in a printed maxi skirt and a blue tank top, which she paired with blue-tinted Ray-Ban aviators.
Later in the day, the Ted star joined her soon-to-be hubby, 36, for dinner at FoodShop in Venice. A source tells Us Weekly: "Ashton and Mila came as guests of another couple. The restaurant is set up with about 45 people all sitting at one long table."
"Ashton was very attentive towards [Mila]," the source added of the couple who enjoyed the evening's Middle Eastern themed menu.
"[Mila] sniffed his wine since she can't drink. They were very chatty and laughing … Ashton and Mila kissed after the group toasted their wine glasses. They were super cute," the source continued.
The 30-year-old also stayed true to typical pregnancy cravings. "Mila ate a lot of pickles! That was part of the meal, but she ate more than the others," the source added.
The couple helped celebrate Tausha's wedding to Kenny Kordisch in Slidell, LA., attending the duo's nuptials just last month on April 22.