The 28-year-old actress gand 45-year-old actor got close during a visit Sunday to Muyil Lagoon, according to E! News.
Entertainment Tonight said Duhamel and Gonzalez kissed and embraced during their outing on the water.
Duhamel wore a t-shirt and white board shorts, while Gonzalez sported a sharkskin print bikini.
Duhamel and Gonzalez were first linked in February following the actor's split from Fergie. The pair stepped out together for a dinner date at Matsuhisa Beverly Hills restaurant in June.
"Their relationship started out slowly, but lately, they are spending more time together," a source told People at the time. "They seem very happy."
Duhamel separated from Fergie in September after eight years of marriage. Fergie, who is parent to 4-year-old son Axl with the actor, subsequently told Entertainment Tonight she and Duhamel remain friends.
"We're great friends, Josh and I," the singer said.
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"There's so much love we have for each other. We really like each other, we have fun with each other."
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