See a funny photo of Ben Affleck sporting a red lipstick kiss mark on his cheek at the Las Vegas premiere of Runner Runner on Sept. 18. Credit: David Becker/Getty Images

At least it's not on his collar! Ben Affleck didn't have wife Jennifer Garner on his arm at the Las Vegas premiere of his latest movie, Runner Runner, on Wednesday, Sept. 18, but he did have a big lipstick mark on his cheek!

The handsome 41-year-old actor walked the red carpet along with costar Justin Timberlake wearing a gray suit and tie. He happily posed for photos seemingly unaware that a red lipstick mark was lingering on the right side of his face.

The kiss mark in question may have been a parting gift from greeting costar Gemma Arterton on the carpet. The 27-year-old British actress looked stunning in a green Burberry dress, which she paired with sexy red lipstick. 

Affleck's wife Garner, 41, was photographed that same day taking two of their three children -- Seraphina, 4, and Samuel, 18 months -- to breakfast in Santa Monica, Calif.

In the September 2013 issue of Allure, Garner opened up about why she and her husband like to attend some red carpet events separate. "It's a very conscious decision," she explained. "Sometimes it's a pain because my heels are so high and it would be nice to have his arm. And he's such a great date! But it can be too much. I think especially for women, they can really lose their identity and just become 'wife of'."