The pair attended a screening of The Last Duel, a historical drama directed by Ridley Scott, co-written by and starring Affleck.
Lopez and Affleck – known as a couple under the nickname Bennifer – made their reunion Instagram-official in July after a period of mounting speculation.
In Venice, they held hands while walking the red carpet and posed for photographs together, at one point kissing in front of the cameras. They were seen earlier in the day boarding a taxi boat after Affleck took part in a photocall.
The couple were first in a relationship back in 2002. They got engaged in November of that year. That was the same month Affleck appeared in the famous video for Lopez’s hit song “Jenny From the Block”.
Affleck and Lopez announced in January 2004 that they had called off their engagement.
Rumours that they had reunited surfaced in May this year and were later confirmed by the couple.