Jennifer Aniston is planning a three-day wedding.

The former 'Friends' actress had initially planned an intimate ceremony for when she ties the knot with Justin Theroux but the couple's celebration ideas are growing increasingly more ''extravagant''.

A source said: ''What started out as quite low-key is now looking more extravagant.

''They are still keen on a beach wedding in Hawaii or Mexico towards the end of the year, but Jen wants it to be more like a massive party and, at the moment, it looks like it could stretch over three days. Half of Hollywood will be there too.''

After Jennifer showed off her eight-carat emerald-cut diamond for the first time last week, there is now speculation she will break from her usual simple, classic styles when choosing a wedding dress.

A source told Grazia magazine: ''The dress is being kept top secret. But now Jen's debuted this massive ring, it's kind of set a precedent so who knows, we could see Jen break from her conservative, simple style and go for a show-stopper of a dress too.''