Jessica Chastain and Oscar Isaac created a buzz with their flirty behavior as they walked the red carpet at the Venice Film Festival on Saturday.
The pair, who were there to promote their HBO miniseries "Scenes from a Marriage," held hands and nuzzled close to one another during their stroll.
Images of the co-stars showing off their undeniable chemistry quickly went viral — including one slow-motion video shared by "Entertainment Tonight" that showed Chastain, 44, smiling as Isaac, 42, strokes and kisses her inner arm.
Fans couldn't help wondering exactly what was going on between the two actors, and they took to the internet to say so.
"This video of Oscar Isaac and Jessica Chastain is quite literally the sexiest thing I have ever seen," one tweeted.
"Want someone to look at me the way Oscar Isaac looks at Jessica Chastain," tweeted another.
But the sexy red-carpet appearance was nothing but a sweet romp for the longtime pals, who attended Juilliard together and previously starred together in 2014's "A Most Violent Year."
"We're acting, but also Oscar and I have been friends — we went to college together — so we've been friends more than half of our lives," Chastain said Wednesday on the 3rd hour of TODAY.
"We know so much about each other, so we know how to make each other laugh without even saying anything," she continued. "We can almost read each other's minds. It also means we could hurt each other really strongly. In the scenes, we would know how to get to the other one."
In real life, Chastain tied the knot with fashion executive Gian Luca Passi de Preposulo in 2017 — the same year Isaac married director Elvira Lind.
Chastain had a ball with all the viral hoopla on her own Twitter page on Monday. The "Eyes of Tammy Faye" star shared a pic of Gomez Addams (John Astin) of the 1960s sitcom "The Addams Family" romantically smooching his wife Morticia's (Carolyn Jones) arm.
"Sept 12th," she captioned it — as in, that's when "Scenes from a Marriage" premieres on HBO.
On the 3rd hour of TODAY, when asked about her viral moment with Isaac, she said, "Let me just say, though, this is a slow-motion video, and everybody is super sexy in slow motion."
"I think it was really funny because when you look at it in regular speed, I'm looking straight ahead and he looks over at me and he just kind of goes to give me a peck on my elbow, and at the same time, I'm going to give him a hug," she added.
"So all of a sudden, his face ends up in my armpit. He made a joke out of it. Look, he's smiling there!" she said while watching the footage. "All the photographers started laughing, and were like, 'What just happened?'"
Chastain joked the extra attention on the moment could be attributed to the lack of human interaction over the past year due to the pandemic.
"We have all been locked in our houses for so long. When this video went viral, I was like, people just need to see people touch and hold each other."
Of course, lots of fans figured that the pair's amorous ways were all just fun and games. But they still loved to see it.
"I actually don’t care that the Oscar Isaac and Jessica Chastain stuff is a ploy," one fan tweeted.
"They clearly took lessons from the Bradley Cooper and Lady Gaga school of putting on a SHOW for promotional/awards purposes and it’s working on me! I’m have (sic) a blast over here!"