Jennifer Lawrence is said to be wary of boyfriend Nicholas Hoult working with Kristen Stewart.
The Hollywood couple met on the set of 2011's X Men: First Class, and have had an on/off relationship ever since.
After the pair split early last year, they are now firmly back together and weren't shy about putting on a public display of affection at this year's Golden Globes.
But now sources say 23-year-old Jennifer isn't happy about Nicholas, 24, starring alongside Kristen in upcoming movie Equals.
"It's not that Jen doesn't trust Nicholas, but it's hard for her to trust Kristen after she cheated on Rob with a married director," a source told British magazine Heat.
Kristen, 23, was caught kissing Rupert Sanders, who directed her in Snow White and the Huntsman, in 2012 while she was dating Robert Pattinson and he was married to Liberty Ross.
Kristen and Robert broke up, before reuniting. They later split again, with sources blaming the infidelity as one of the reasons.
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