Jennifer Lawrence and Chris Pratt are two of the most favorite stars in Hollywood right now. And on the press tour for their upcoming romantic sci-fi thriller "Passengers," the two have exchanged insults.

Pratt and Lawrence sat down with a German tabloid, wherein Pratt showed off his language skills, much to Lawrence's surprise. "Very impressive. I don't know what he's doing," she said, to which he quickly joked back, "This is called another language: German, Deutsche."

Pratt also posted a series of Instagram photos, explaining that since his fans wanted a selfie featuring the co-stars, he'd deliver. Only, he cut out Jennifer Lawrence in all of them.

And as to revenge, Jennifer Lawrence used her appearance on "Jimmy Kimmel Live." As a bus advertising "Passengers"drove by, Lawrence whipped out a can of black spray paint and covered Pratt's face. Kimmel helped too, making "Passengers" read just 'Ass' and drawing an arrow to Pratt, the same media source cited.

The duo's latest trick was sitting down for a round of "Playground Insults," a game devised by BBC Radio 1 that pits celebrities against each other to see who can crack the other one up with personal slights first and Lawrence and Pratt were reported not afraid to get personal.

Pratt almost breaks Lawrence with: "Why did they call it 'Joy'?" He also offered, "It's such a shame to meet somebody you thought you'd like."

But Lawrence had it as well: "You are so dumb that your 3-year-old son probably taught you everything you know," she offered, following up with, "Where do you keep your Oscar?"

"Passengers" is about two people onboard a spaceship transporting them to a new life on another planet. Aurora Dunn (Jennifer Lawrence) is a journalist from New York City who is interested in cosmic travel. Jim Preston (Chris Pratt) is a mechanical engineer from Denver who wants to leave Earth. The movie will hit theaters on Dec. 21.