Mel Gibson looked super pissed to be photographed on the set of his film Edge of Darkness in Boston earlier this month. Gibson plays a homicide detective who finds a government conspiracy while investigating the death of his activist daughter, according to IMDB. The film is directed by Martin Campbell, who also directed Casino Royale.

Gibson probably wasn’t just mad that he was snapped furiously smoking a cigarette. The paparazzi also got pictures of a lovely Russian woman named Oksana, who was first seen with him on set in August, following him. They say Oksana is not cast or crew and it looks suspicious that she’s on set and is closely trailing Gibson. Maybe she works for him in some kind of official capacity though:

Exclusive… Fame Pictures first broke the exclusive story of Mel Gibson and his mysterious Russian companion and rumored mistress, Oksana, in August, and when the story went public, she quickly disappeared from the Boston set of “Edge of Darkness.” However, Fame photographers were shocked to see the return of the beautiful young Russian to the set on November 3rd, reigniting rumors questioning the type of relationship shared between the two and casting doubt on Gibson’s dedication to his pious religious beliefs and to his 28-year marriage to wife, Robyn. While Gibson’s spokesperson tried to quash the original rumors of Mel’s mistress by saying she was “one of the artists on Mel’s recording label in the US recording,” Oksana’s reappearance by Mel’s side confirms suspicions that she is more to Mel than just a colleague. On Monday, November 3rd, a weary Mel Gibson walked across the set of “Darkness,” casually smoking a cigarette. Minutes later, an angelic but cautious Oksana walked the same path. Sources confirm that Oksana has no role in the film or job on the set, so her presence on set and her consistent proximity to Gibson is undeniably puzzling. Gibson is back in front of the camera for the first time since his widely publicized anti-Semitic comments made during a drunk driving arrest and his behavior is certainly under scrutiny during the filming. Oksana’s mysterious appearance brings further scrutiny to Gibson’s character, infidelity, and lascivious nature. These images were shot between 10/30/08-11/03/08.

[From Fame Pictures photo description, public link not available]

She could definitely be some kind of assistant, but it does look strange for Gibson. He has been married for 28 years to his wife Robyn Moore and they have seven children and one grandchild. Gibson is a devout Catholic and follows the Opus Dei Sedvacantism sect. (Thanks Mairead!)

Gibson faced a very public battle with alcoholism after his arrest for DUI in July, 2006 in Malibu in which he went on an anti-semitic rant against the arresting officer. Photos later came out of him that night partying with young women. This will be Gibson’s first time in front of the camera since that infamous incident and if he is having an affair he should try a lot harder to hide it.