'He spent an entire day improv-ing insults at me!' Jennifer Lawrence admits she struggled to contain her laughter while filming Don't Look Up with Jonah Hill

They're starring together in the star-studded Netflix hit, Don't Look Up.

And Jennifer Lawrence, 31, has revealed that she struggled to maintain her composure after Jonah Hill, 38, spent an entire day improvising insults on set. 

The actress confessed she found filming 'really really hard,' because the funnyman kept trying to make her laugh during takes.  

In an interview with Vanity Fair on YouTube, Jennifer said: 'He is the worst. It was really, really hard filming with Jonah, and just not ruining take after take, laughing.' 

She detailed a time when Jonah spent a whole day insulting her whilst they were filming for the hit Netflix movie. 

Jennifer continued: 'We one time dedicated an entire day to him just improv-ing insults at me. It was amazing.

'He and Meryl are the only ones who really should do that kind of improv. I mean, he’s just a comedic master. We all did some stuff. Just not as well as Jonah.'

Don't Look Up sees Meryl taking on the role of the President of the United States, with Jonah playing both her son and political aide.

The film follows Leonardo Dicaprio and Jennifer as astronomers who are desperately trying to warn not only the United States government but also civilians that a 'planet killing' comet is heading toward earth. 

The cast also includes Cate Blanchett, Kid Cudi, Tyler Perry, Chris Evans, Timothee Chalamet and Ariana Grande in the disaster film with a twist of dark comedy.

The film from director Adam McKay, was released in theaters on December 10 and on Netflix's streaming service on December 24.  

The official Netflix synopsis reads: 'Two astronomers go on a media tour to warn humankind of a planet-killing comet hurtling toward Earth. The response from a distracted world: Meh.' 

The official trailer which was released last month, says the movie is 'based on real events,' as it kicks off.

The clip opens with Leonardo, who plays Dr Randall Mindy, and Jennifer, as Kate Dibiasky, taking in the information that a comet is heading toward earth and may destroy all of humanity.