Ben Affleck and Jennifer Garner' marriage seems as strong as ever as they celebrated their 9-year anniversary.

The happy couple enjoyed a very intimate romantic meal at Bistro 82, a French restaurant located in the Royal Oak suburb of Detroit, Michigan, on Sunday (June 29th).

Affleck is currently in Motown filming 'Batman vs. Superman: Dawn of Justice.'

"They were drinking red wine," an eye witness told Us Weekly.

"They looked relaxed," the source continued. "No one was really bothering them at all - they were really normal, they fit in."

Affleck and Garner first began dating in 2004 after meeting on the set of 'Daredevil,' around one year later they tied the knot in a private ceremony in the Caribbean. The Hollywood duo are parents to three children, daughters Violet, 8, and Seraphina, 5, and son Samuel, 2.

"Jen was wearing a black dress and Ben was in jeans with disheveled hair. They were walking slowly by and they seemed relaxed and in good spirits," another fellow diner told E!News.

"They were walking very closely together," the insider added. "As they were walking out, Ben took a cigarette out and put it in his mouth and they walked out of the restaurant and he stopped and lit the cigarette. They then walked out together and headed down the street."

The pair obviously had a romantic evening, and the recent claims made by Mark Ruffalo haven't seemed to have had an effect on them.

More: Ben Affleck to get standalone Batman movie?

The 46 year-old actor recently appeared on 'Watch What Happens Live!' when a viewer asked if he and his '13 Going on 30' (2004) co-star, Garner, are still friends.

Ruffalo quickly responded no, before adding, "we had a great time together (while filming the movie), and I think we would, but then Ben came on the scene and that was the end of that."

More: Jennifer Garner 'never understood' Ben Affleck's gambling obsession

The chat show's host, Andy Cohen, then jokingly chimed in by saying, "I heard he doesn't allow her to have male friends," to which Ruffalo shrugged and pleaded the fifth. "I made that part up," Cohen then added.

Ben Affleck
Affleck and Garner tied the knot in 2005