The 41-year-old star who has three kids, Violet, Seraphina and Samuel with husband Ben Affleck, confronted the paparazzo by pointing her camera at his face, reported E!Online.
Garner had joined hands with actress Halle Berry to support a proposed anti-paparazzi bill that would make photographing their children without their permission a crime.
"I chose a public life. My three children are private citizens. I love my kids. They're beautiful and sweet and innocent, and I don't want a gang of shouting, arguing, lawbreaking photographers who camp out everywhere we are all day, every day, to continue traumatising my kids," Garner had said at the time.