The buzz regarding the status of Smith's marriage to actress Jada Pinkett-Smith started when flirty pictures taken in a photo booth on the set of his movie, "Focus," were published by Star magazine this week.
Smith and Robbie, his co-star in the film, are seen in the pictures cuddling and lifting up their shirts, while making faces.
Although Smith has not publicly spoken about the controversy, Robbie turned to Twitter to clear up the matter.
"Been working non-stop, just catching my breath. There's absolutely no truth to the ridiculous rumor," she tweeted. "It's disappointing that goofing around on set could be taken so out of context."
People.com quoted an unnamed source as saying Smith and Robbie "are just friends and were just being silly" when they took the photos.
"Will and Jada's marriage is fine. Everyone there knows it was nothing," the insider said.