Caught in the Act

Ashton Kutcher & Mila Kunis Share 'Flirtatious' Lunch in Chicago

12/27/2012 at 05:10 PM EST

After spending some quality time in Iowa over the holidays, Ashton Kutcher and Mila Kunis visited Chicago on Thursday.

Around noon, the couple stopped into eco-friendly restaurant Prasino.

"They were both very courteous to the staff and flirtatious with each other," an onlooker tells PEOPLE.

At the restaurant celebrated for its farm-to-table cuisine, the former That 70s Show costars shared dishes including the short rib skillet and Florentine crepes.
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