The couple - who have had an on/off relationship since 2006 – visited the port of Trouville-sur-Mer on Tuesday, and enjoyed an intimate lunch at restaurant Les Vapeurs.
A staff member said: “They were like any normal young couple. She held his hand and they were very nice, no pretensions.”
After an hour-long lunch, the pair drove to the 18th century port of Honfleur, where they wandered around shops and visited art galleries.
The Hollywood stars later returned to Trouville, where they stopped at small backstreet restaurant L'Inattendu for dinner.
A fellow diner said: “They were very comfortable with each other. There was lots of talking going on between them, laughter.”
On Wednesday Kate, 29, and Owen, 40, returned to Les Vapeurs for lunch, before travelling to the Normandy Cemetery – where those who lost their lives in the D-Day landings in World War II are buried.
The pair then returned to Paris, where Owen teamed up with Jennifer Aniston to promote new movie ‘Marley and Me’.
The couple sparked rumours they had rekindled their romance earlier this month when Kate was seen visiting Owen at his Malibu home.
A source said: “Kate has been coming to the house religiously. She is here at least a couple times a week and she has been sunbathing in the back yard, hanging out by the swimming pool.”
The pair first began dating after meeting on the set of 'You, Me and Dupree' in 2006. They had a nine-month relationship but soon after their split in summer 2007, Owen tried to commit suicide.
The got back together briefly last year but broke up in May, before being linked again in August.
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