“Jen's thrilled to be getting married but she's leaving nothing to chance,” a friend of Jennifer told a leading newspaper.

“She wants to make sure all her assets are protected, especially with her track record with men.”

Aniston has previously dated musician John Mayer in the past and was married to Brad Pitt.

There are also some reports Brad pitt spoke with his ex-wife, who he split from in 2005, to express his feeling over the news she is marrying actor Theroux.

A source said, “Brad gave Jen a quick call to say how pleased he was to hear that she was getting married. He jokingly asked if he should 'save the date', and they both laughed, but told her in all seriousness that he was really happy for her and Justin. He wished her luck and told her he hopes they're very happy together.”