Ben Affleck and new girlfriend Ana De Armas are back in L.A. after a romantic vacay in Costa Rica. The two were seen strolling arm-in-arm on the beach in the Central American country before they headed home where they visited some friends today. Ana brought along her adorable pup ... hey, if she's already introducing her pet to Ben, it must be true love!


Ben even lended Ana the keys to his Mercedes so it's looking pretty serious!


While she was cruising around town in his slick ride, Ben spent the day bonding with his children by making a stop to Petco and then listening to the birds at a local park.