Premiere of “Avengers: Infinity Wars” - Arrivals - Los Angeles, California. Picture: Reuters

Actors Scarlett Johansson and Colin Jost smiled and held hands as they walked their first red carpet together for the premiere of "Avengers: Infinity War" here.

While the two have kept their romance under wraps since they first sparked dating rumors in May 2017, they couldn't help but look happy in each others' presence as they smiled at each other and held hands, reported

Before the big event, the actress, 33, also made an appearance on "The Ellen DeGeneres Show" where the host Ellen DeGeneres jokingly set out to tear the couple apart by sharing shocking throwback photo of Jost with a full-grown beard.

"He's adorable, he's funny. I'm happy for you," DeGeneres said during the episode airing on Tuesday.

"I thought this was a disguise but that's really what he looked like. Had you seen that?" she added.

Johansson, 33, looked wide-eyed at the photo before saying: "I mean I can't unsee it now. Oh my God, it is. Wow."

"Have I just broke y'all up? Did I do something wrong?" DeGeneres asked.

Johansson continued to look shocked, saying, "I can't say that that's an image that I'll ever forget."