The lovebirds were pictured leaving the London event's afterparty in the early hours, with the Mamma Mia! star chivalrously opening and closing the car door for the beauty.
The couple confirmed their relationship with a romantic holiday in August, four months after Dominic ended his eight year relationship with actress Ruth Negga.
However, yesterday's bash marked the first time the pair have shown off their romance at a public event.
Gemma looked stunning in a pastel green gown that was made even more glamorous with the addition of a fur coat.
Preacher star Dominic was sharp-suited for the occasion in a dapper black suit.
While the pair rarely speak about their relationship, the Crazy Rich Asians star was spotted moving some of her belongings into Dom's London pad in September.
Gemma, who played sexy Mia in Channel 4's Humans, called time on her romance with comic Jack Whitehall last December after six years together.
The pair blamed their split on hectic work schedules, with a source telling us at the time: "Jack and Gemma secretly pulled the plug on their relationship but remain good friends.
"It’s sad but they remain supportive of one another."
The actress co-starred with Dominic in 2017 action thriller Stratton, about a British commando trying to track down a terrorist cell.
The movie was panned by critics, but their budding romance will have softened the blow.
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