The inseparable pair - who posed outside the Dolby Theatre an hour apart - have never gone red carpet official as a couple despite being together as far back as 2022
The former Little Mix star, 32, who beat the likes of Charli XCX to be crowned Best Pop Act at the ceremony earlier in the evening, couldn't wipe the smile off her face.
The Step Up alum, 44, who split from ex Zoe Kravitz in October after three years of dating, held hands with the brunette beauty as they made their way out of the A-list event.
Meghan Markle is not afraid of public displays of affection. In mid-February, the Duchess of Sussex, 43, packed on the PDA with Prince Harry, 40, during the Invictus Games in Vancouver.
James Argent packed on the PDA with stunning girlfriend Nicoline Artursson this week as they enjoyed a romantic beach day amid their holiday to Barbados.