EXCLUSIVE: What Really Went on During Olivia Munn and Jamie Foxx's Playful Mayweather vs. McGregor Posing

Olivia Munn and Jamie Foxx posed on the red carpet together at the Mayweather vs. McGregor fight in Las Vegas on Saturday, sparking rumors of a romance between the two.

Munn, clad in a sparkling floral Balmain mini dress and strappy Saint Laurent heels, playfully punched Foxx in the chin in one snap, while the comedian was seen with his arm around the actress in another shot.

Getty Images
Getty Images

However, an eyewitness tells ET there was "nothing to it," adding that the two arrived separately, and Munn, 37, was actually posing for photos alone. The X-Men: Apocalypse star waved when Foxx, 49, stepped on the red carpet, which prompted photographers to encourage to pair to pose together for photos. Foxx actually arrived with an entourage of male friends to the event -- who stood behind him as he did interviews -- while Munn walked the red carpet solo. 

Interestingly enough, Foxx and Munn were romantically linked in 2010, though the Baby Driver actor later stated that he and the actress were just "great friends."

In April, a source told ET that Foxx and actress Katie Holmes were still very much dating. The two have been dodging romance rumors since August 2013, after they danced together onstage at the 4th Annual Apollo in the Hamptons Benefit.

Meanwhile, Munn called it quits last spring with Green Bay Packers quarterback Aaron Rodgers, after nearly three years of dating. A source close to the actress told ET that the pair simply "grew apart."

"It wasn't over anything specific," the source stated. "They just grew apart over time. They tried to make it work but just couldn't."

For more on the actress, watch the video below.