Scarlett Johansson looked sensational in her frockCredit: Splash News

Scarlett was dressed to impress as she gave a glimpse of her back tattoo in her flirty gown at red carpet event with Colin, who looked smart in a tuxedo.

The Avengers star gave a flash of the rose branch tattoo as she posed in her dress with her back to cameras.

The 33-year-old was clearly delighted with the inking, having showed it off in a similarly low-cut gown at the Emmys back in September.

Lucy star Scarlett glammed up with a nude make-up palette and diamond earrings.

Scarlett and Colin looked great together as they arrivedCredit: AP:Associated Press

The pair, who have been dating for over a year, could not stop smiling at each other as they hit the red carpet side-by-side.

The couple were first linked in May 2017 when they were seen kissing at an SNL after-party.

They did not confirm their relationship until December that year.

That is when they made their first red carpet appearance together at the American Museum of Natural History Gala in NYC.

She looked like a modern day princess in her outfitCredit: Splash News

Scarlett was previously married to Ryan Reynolds but they divorced in 2011, with the actor moving on with Blake Lively.

Scarlett started dating Frenchman Romain Dauriac in 2012, and they became engaged the following year.

The pair married and welcomed daughter Rose together in 2014, before splitting two years later.