Justin Theroux's proposal to Jennifer Aniston was ''one of the sneakiest jobs'' she has ever seen.

The 43-year-old actress was shocked when her boyfriend of just over a year proposed to her on his birthday in August but admitted she is happier than she has ever been.

She said: ''The biggest story right now is that I have a beautiful partner and a lot of joy. Every. Single. Day. I didn't know what I wanted for a ring. He just knows what I like. The proposal was one of the sneakiest jobs I've ever seen. I had no idea.''

While Jennifer - who was previously married to Brad Pitt - isn't giving away any details on the wedding, she doesn't plan to deviate from her own classic style for the big day.

She explained to People magazine: ''A bride should look like herself. Just be yourself. If you try something new, you'll feel uncomfortable.''

It was recently revealed Jennifer is planning a three-day wedding after initially wanting something quite small.

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.''