Actress Jennifer Aniston has reportedly been attending sessions with a confidence coach ahead of actor George Clooney's wedding as she fears she will run into her ex-husband Brad Pitt at the celebrations.

Aniston, who is engaged to Justin Theroux, is said to be nervous of coming face-to-face with Pitt and his fiancee Angelina Jolie when their mutual friend Clooney ties the knot with lawyer Amal Alamuddin later this year, so she is doing everything she can to put her anxieties to rest, reports contactmusic.com.

`Jen's no stranger to therapy, so she decided to seek some help,` a source was quoted as saying by Britain's Grazia magazine.

`At the wedding, she'll have Justin there for support, but the thought 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 up about coming face-to-face with them.

`She has also been having hypnotherapy,` the source added.

Though Aniston has seen Brangelina only once, at the 2009 Oscars, since they divorced nine years ago, she is said to be particularly concerned about the wedding as it will be so intimate.