The duo — dubbed as Bennifer — looked all loved up after touching down in the romantic city on Thursday ahead of their expected red carpet debut as a couple.
J Lo, 52, and Affleck, 49, were spotted taking advantage of the city's beautiful canals while enjoying their day off before the actor's Friday movie premiere.
The Love Don't Cost A Thing singer might be used to the spotlight but she proved she's a supportive girlfriend by flying halfway around the world to spend time with her boyfriend of five months.
J Lo stunned in all white while cuddling up to Affleck in a private boat taxi while taking in all the sights the city of water has to offer.
Covering up her voluptuous curves in a lace dress with a bowtie, the bombshell accessorized her look with a black purse and matching stilettos.
As for Affleck, swoon! The Justice League actor wore a flattering black shirt that showed off every inch of his chest muscles.
Completing the number with his favorite black jeans, Affleck slipped into matching sneakers and proudly held onto his leading lady.
Continuing their PDA tour, the lovers left no room between them in their water taxi.
J Lo was practically sitting on Affleck's lap while the two toured Venice. The PDA didn't stop once they got on dry land either. The couple was photographed holding hands while walking through the city.
This is the first time we've seen the duo together in weeks.
J Lo has been overseas and was caught in a hail storm alongside Kourtney Kardashian and Kris Jenner.
The A-listers were seen ducking for cover after golf-sized ice ripped through the Dolce & Gabbana outdoor fashion show last week.
Meanwhile, Affleck has been making sure to get plenty of dad time with his children — Violet, 15, Seraphina, 12, and Samuel, 9.
On Tuesday, a nervous Affleck was even photographed giving his oldest daughter driving lessons.
J Lo and Affleck are currently in Venice for the film festival. They are expected to make their red carpet debut tomorrow during the premiere of The Last Duel, a drama that Affleck wrote with his best friend, Matt Damon.