An eyewitness tells ET that the two arrived and left the event separately, with Affleck staying for about an hour and Garner staying about 30 minutes longer. The parents to 11-year-old Violet, 8-year-old Seraphina and 5-year-old Samuel were not seen saying goodbye to each other.
"Jen did not seem to be in a rush," the eyewitness reveals. "Ben and Jen were near each other outside of the event, but Jen was mainly socializing with other parents and people there."
According to the eyewitness, the 45-year-old actress was seen "enjoying herself, very happy, chatty and relaxed," while her estranged husband "was a bit serious." "Ben has not shaved and it looked like he had stains on his shirt," the eyewitness says.
Both Garner and Affleck adorably sported name tags to the event, which they attended with Seraphina and Samuel.