Jennifer Aniston has collapsed on the set of her new movie, Break Up, where she stars with Vince Vaughn.

Jennifer collapsed after complaining of nausea and severe headaches, Ananova reports.

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.

Jennifer Aniston filed for divorce with Brad Pitt in January, and Pitt has since been seen in various exotic locations with Angelina Jolie and her son, Maddox.

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

Jennifer Aniston denounced the rumors that she and co-star Vince Vaughn have become a romantic item. 

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