The pair were spotted Wednesday in Buenos Aires during the first photo call for their film "Focus," Us Weekly reported.
Rumors started swirling earlier this month that Smith, 49, and Robbie, 23, were dating after photos of the two goofing around in a photo booth surfaced online.
"That was a photo booth on set that the producers got for everyone," a source told Us Weekly. "It was the last day of filming and everyone was taking pictures. They were just goofing around. Will is just like that. There's nothing more to it."
Smith denied the rumors, saying his marriage with Jada Pinkett Smith "is great."