It looks as though Jennifer Aniston might not be walking down the isle this summer after all. There are new reports that indicate trouble in paradise as she has reportedly called off her wedding to fiancé Justin Theroux.

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There's speculation that Aniston called off her wedding plans because she knows "their relationship won't last" and that neither she nor Theroux have been forthcoming on their reasons for their extended engagement. According to reports, they were scheduled to tie the knot on Theroux's 43rd birthday on August 10, but there have been no definite plans made or any additional information about their wedding aside from Internet gossip blogs.

Meanwhile, it looks as though Aniston has another wedding to worry about as she's been nervously anxious about attending George Clooney's wedding this summer in Italy. Aniston will be reportedly run into her ex-husband Brad Pitt and Angelina Jolie for the first time since their divorce in 2005. The actress is said to be seeking therapy to help with her anxiety about meeting them.

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"Jen's no stranger to therapy, so she decided to seek some help," a source says, according to BANG Showbiz News. "At the wedding she'll have Justin there for support, but the though of seeing Brad and Angelina is quite overwhelming. The therapist has been helping to build her confidence and eliminate the fear she seems to have built about coming face-to-face with them. She has also been having hypnotherapy."

The last time Aniston faced Pitt and Jolie was at the 2009 Oscars, when she was on stage presenting an award while they sat in the audience. The source goes on to explain that because Clooney's wedding will be so intimate, Aniston is particularly concerned about how awkward it might be when she faces her ex.

Aniston's publicist has not commented on the speculation.

Tags: Jennifer Aniston Justin Theroux