13:30 08 July 2005
(BANG) - Jennifer Aniston has collapsed on the set of her movie 'The Break Up'.
The former 'Friends' actress - who complained of nausea and headaches - was later diagnosed with heatstroke.
But sources on set believe the star was overcome with emotion after hearing her ex husband, Brad Pitt, accompanied his alleged lover Angelina Jolie to Ethiopia, where she is adopting a baby.
Stunning Angelina and Hollywood heartthrob Brad have denied they are dating since being photographed looking intimate on the 'Mr & Mrs Smith' set - but it is rumoured the sexy actress played a part in the collapse of Brad and Jen's marriage in January.
A source told Britain's Daily Mail newspaper: "Jennifer'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."
The source added: "She can't have escaped all the stories about Brad and Angelina and it looks like the situation has taken its toll on her."
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