Mila Kunis and Ashton Kutcher Credit: FameFlynet

Ashton Kutcher and Mila Kunis really are just like Us -- they love cheddar bay biscuits and all-you-can-eat crab legs!

Topping off over a week's stay with Kutcher's family in Iowa for the holidays, Kutcher, 34, and girlfriend Kunis, 29, joined the actor's family for a festive dinner Dec. 26 at a Red Lobster in Cedar Rapids, multiple observers confirm to Us Weekly.

Looking "cool and casual," the group of nearly two dozen commandeered a large table in the corner of the eatery -- and had a "fun time" during the meal, the host that seated them told Us. The Black Swan actress "got along well with the family," the host adds. Clad in a sweatshirt and jeans, Kutcher "had his arm around her waist at the table."

Adds another witness: "They were both laughing . . . She looked like she was almost part of the family -- she got along well with them."

According to another witness, Kunis, wearing minimal makeup, talked about "her family and Africa" during the meal.

By the next day, Kunis and Kutcher had moved on to Chicago, where they were spotted having a one-on-one lunch at Prasino. Sharing a short rib skillet and Florentine crepes, the couple was "very courteous to staff and flirtatious with one another," a rep for the farm-to-table restaurant tells Us.

While Kutcher and Kunis kicked off their Midwestern holiday, an attorney for the actor filed divorce papers to sever his union with Demi Moore; the pair separated in November 2011.