Wedding bells were ringing, or at least were expected to be soon, for fiancés Jennifer Aniston and Justin Theroux. However, did recent rumors of a former fling with fellow Hollywood A-lister, Cameron Diaz, thwart their wedding plans?

Jennifer Aniston To Wear 'Spanx' On Her Big Day?

Reportedly, the 45-year-old actress is none too pleased about her fiancé's alleged "fling with Cameron Diaz." According to a report Friday, "news of an alleged dalliance with Cameron in 2002, when the pair worked on movie Charlie's Angels: Full Throttle, has seemingly upset Jennifer."

What's more, a source is said to have told the British magazine, Grazia, that what really ticked Aniston off is when her husband-to-be failed to disclose the information to her himself. "Jen is angry because she didn't find out from Justin himself. She thought she knew all about his history, and Cameron is a friend, so she was embarrassed to only hear the rumor recently and second-hand," claimed the source.

However, it sounds as though Theroux thought nothing of his purported rendezvous with Diaz since, "It was never anything serious, and they haven't seen each other for ages," and thus didn't think to mention it to his soon-to-be wife. Moreover, while recent reports suggest that the couple will make their relationship official during an upcoming wedding ceremony in Hawaii, a definitive date has yet to be announced. So, is this new revelation a potential deal breaker for Aniston?

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Jennifer Aniston, Jennifer aniston justin theroux, Cameron Diaz