The Expendables 3 star, 60, and Rosalind Ross, 24, were spotted exiting hand-in-hand from the CAA award show afterparty at Sunset Tower Hotel on Sunday night, TMZ report.
Gibson wore a black tux with a matching bowtie, while Ross opted for a strapless, purple gown with a flowing train.
Earlier in the evening, Gibson received some friendly, expletive-laden jabs from host Gervais while onstage as a presenter. Gervais joked about the actor’s past drinking habits, and Gibson fired back that seeing the host every three years always reminds him to get a colonoscopy.
Golden Globes 2016: Mel Gibson and Ricky Gervais
As for his beautiful date, Ross and Gibson have been an item at least since this summer and spent time together at the actor’s Costa Rica compound, sources told PEOPLE.
Ross won a gold medal at the World Equestrian Games in Kentucky in 2010, and is also a budding screenwriter. She studied writing and literature at Emerson College and wrote an episode of the El Rey Network s action series Matador.
In 2011, Ross posed sans spandex (along with equestrian partner Devon Maitozo) for ESPN Magazine’s 2011 Body Issue.
According to The Hollywood Reporter, Ross also recently wrote the script for the upcoming film Lioness, an indie drama staring Ellen Page.
Gibson, has kept a low romantic profile in the media since ending his rocky relationship with pianist Oksana Grigorieva with whom he has a 5-year-old daughter.