The couple's sighting came amid pleas for everyone to self-quarantine.
In an interview for Vogue Spain's cover story, De Armas revealed how she was amazed by Affleck's talents even though she already knew how outstanding he is as an actor.
De Armas was wearing a stylish knitted cardigan with white trousers and shoes whereas Affleck was rocking in a black t-shirt and grey jeans.
The couple were seen on a stroll in Los Angeles on Monday evening.
Last week, The Way Back star left a hilarious comment on the de Armas' Instagram after she posted several photos that he took of her on the beach during their Costa Rica vacation. Affleck is spotted carrying two cups of coffee for him and his girlfriend.
Affleck and de Armas are supposed to be on self-quarantine due to the coronavirus outbreak.
Jennifer Garner, Affleck's ex-wife, is on-board with their relationship according to reports. She loves to spend time and have fun with him.
"Ben and Ana have been dating for a few weeks and are enjoying each other's company", a source recently told ET.
"Jen has completely moved on from Ben in a romantic sense". "Ben is sober and in a really good place and Ana respects him for the process he's going through". She is reportedly more than happy and supportive of her ex's budding romance.
Garner and Affleck also continue to see each other for the sake of their three children. They met for their son's classmate's birthday party.
Ben Affleck poses as he arrives for the world premiere of "Triple Frontier" on March 3, 2019 in New York City.