Brad Pitt and Angelina Jolie's chemistry was so strong on the set of Mr and Mrs Smith that it didn't take long for rumours of an affair to start flying.
Brad - who turns 57 today - split from wife Jennifer Aniston less than 12 months later - and both he and Angelina initially denied any romantic involvement before admitting they'd 'fallen in love' during the 2004 shoot.
Indeed, Angelina's former bodyguard Mark Behar previously claimed he caught the pair "making out" in their trailers and that he helped pass notes between them, although both stars denied anything physical happened. "[Angelina] and Brad were constantly laughing and flirting with each other and acting like two school kids who had the hots for each other, and it was so
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