Jennifer Aniston has reportedly collapsed on the set of her new movie.

The star currently filming The Break Up in Chicago collapsed after complaining of nausea and severe headaches.

She was officially diagnosed with heatstroke reports the Daily Mail.

But sources on set insist she passed out as a result of stress.

An insider said: "She's been walking around with a sad look on her face and has not been her usual self. While her collapse was blamed on heatstroke, everyone thinks it's more down to stress than anything else."

"She can't have escaped all the stories about Brad and Angelina and it looks like the situation has taken its toll on her."

Jolie and Pitt have repeatedly denied reports they are a couple since Pitt and Aniston ended their marriage in January.

Source: Press Release