10/01/2013 11:19 EDT

Jennifer Aniston 'Chooses Wedding Dress'

TORONTO, ON - SEPTEMBER 14: Actress/producer Jennifer Aniston arrives at the 'Life Of Crime' Premiere during the 2013 Toronto International Film Festival at Roy Thomson Hall on September 14, 2013 in Toronto, Canada. (Photo by Jag Gundu/Getty Images)

Jennifer Aniston has apparently been having secret wedding dress fittings.

The former "Friends" star is engaged to actor Justin Theroux and there has been plenty of speculation about when they will eventually tie the knot.

British magazine Star now claims it will be a fall wedding and that Jennifer has already selected her dream dress.

"Jennifer has chosen British designer Vivienne Westwood to create her gown," a source told the publication.

"She's a big fan of her romantic, figure-flattering styles and recently wore a blue, corseted Westwood dress at the Toronto Film Festival."

Justin and Jennifer announced their engagement in August last year. Since then there has been gossip the pair are expecting a baby, after Jennifer was snapped with a slightly rounded belly.

Apparently her chosen dress will be extremely flattering on any problem areas.

"Her off-white wedding gown also features a corset bodice, which highlights Jen's figure while flattening that bit of 'tummy bulge' she recently admitted to, when she denied rumours she was expecting a baby," the source added.

"Choosing a UK rather than a US designer is also a nod to her fiancé's British family connections."

According to another insider, the couple will get married at their Bel Air home.

They will allegedly have a "sunset wedding" and exchange simple gold bands, with Justin apparently keen to have a special message engraved in the rings.

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