The 60-year-old Oscar winner walked the red carpet with his 26-year-old girlfriend, Rosalind Ross, who is pregnant with his ninth child. Gibson currently has six sons (Christian, Milo, Louis, Thomas, Edward and William) and two daughters (Hannah and Lucia), but he kept mum on the gender of his latest bundle of joy.
"You could take a guess and you'd be 50 percent right," Gibson teased.
The director, who showed a much sweeter side on Monday night, was a natural calling the shots for his gritty new war drama, Hacksaw Ridge.
Based on a true story, the movie follows Desmond Doss (Andrew Garfield), who saved 75 men during the bloodiest battle of World War II without a gun.
Doss was the only American soldier in WWII to fight on the front lines unarmed, but Garfield dug deep into his arsenal of weapons to pull off a powerful acting performance.
"He's a rare actor," Gibson gushed. "He's excellent at what he does. He's able to minimally give volumes with just a look. He doesn't need a whole bunch of dialogue. All his actions, his body language, his thoughts -- you can see what he's thinking through his eyes. I don't know how he does that."
After taking some time out of the spotlight, Hacksaw Ridge is a part of Gibson's directorial comeback, which seems to have been well-received. The Hollywood Film Awards will honor Gibson on Nov. 6 with the Hollywood Director Award during a ceremony hosted by James Corden.