Caylee Cowan and Casey Affleck enjoy a day of sightseeing in Rome

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Casey Affleck, 47, cozies up to glamorous girlfriend Caylee Cowan, 24, at the amfAR Gala in Venice

Casey Affleck, 47, and beau Caylee Cowan, 24, share a smooch on boat at Venice Film Festival

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Casey Affleck, 47, cozies up to glamorous girlfriend Caylee Cowan, 24, at the amfAR Gala in Venice