Florence Pugh's fans praised the star for helping Emily Blunt after she almost suffered a wardrobe malfunction.
The stars were posing for pictures at the Oppenheimer photocall in London on Wednesday when the incident occurred.
A Quiet Place star Emily showed up at the photocall rocking gold, metallic trousers and a matching blazer complete with black buttons.
Oppenheimer co-star Florence looked stunning in a blue Moschino shirt dress with a low-cut neckline.
In pictures shared online, Emily's jacket seemingly popped open while posing for the cameras with Florence.
Zach Braff gushes over ex Florence Pugh calling her 'one of the greatest actors'Emily gasped as she held her blazer shut while Florence looked down to see what she was reacting to.
Don't Worry Darling actress Florence rushed to help close the blazer as the two burst out laughing at the mishap.
Fans thought the moment between the two was sweet and took to social media to applaud Florence.
One user said: "florence pugh is a real one for protecting emily blunt from a wardrobe malfunction."
"That is real support and an act of love," another said while one posted: "That’s what happens when you have great chemistry with your costars."
One excited fan commented: "Literally my worlds colliding."
Florence and Emily star as Jean Tatlock and Katherine "Kitty" Oppenheimer respectively in the upcoming film, Oppenheimer.
They star alongside leading man Cillian Murphy, Robert Downey Jr, Matt Damon, Josh Hartnett, Casey Affleck, Rami Malek and Kenneth Branagh.
It comes as the cast supported the ongoing actors' strikes by walking out of the UK premiere an hour earlier than scheduled to join the walkout.
US actors union Sag-Aftra had recently announced its first major members strike in over 40 years.
Make-up free Florence Pugh struggles to stay awake hours after Baftas partyingHowever, just moments into the event at the Odeon in Leicester Square, director Christopher Nolan explained that the star-studded line-up had left.
In front of the audience, Nolan said: "You've seen them here earlier on the red carpet. Unfortunately, they're off to write their picket signs for what we believe to be an imminent strike by Sag, joining one of my guilds, the Writers Guild, in the struggle for fair wages for working members of the unions, and we support them."
Before the movie started inside the cinema, Matt Damon explained that he and his co-stars were walking out in "solidarity". Explaining to Variety, he said that once the strike was officially called, they were "going to walk obviously in solidarity".
He went on to say: "That's why we moved this [red carpet] up because we know the second it's called, we're going home."