Bell, 31, sported black jeans, a gray shirt and a bomber jacket at the event. Mara, 34, looked cute in black jeans, converse, a n:PHILANTHROPY tee and a light-colored coat -- though switched jackets later in the day.
Mara and Bell worked together on 2015's Fantastic Four, and started dating shortly after. The two tied the knot in Los Angeles in July.
In an interview with ES Magazine last month, Bell opened up about their relationship, explaining that, "there was an instant connection, like we’d known one another forever, It was obvious very quickly that we were going to get married."