The couple - who have been dating on and off for five years before getting engaged in December - will reportedly tie the knot at a private estate later this year with Jessica planning to wear a custom made Monique Lhuillier dress.
A source told USmagazine.com: "The big day`s this summer at a private estate. Monique Lhuillier is her number one choice for the dress."
Despite refusing to confirm their engagement, Jessica showed off her engagement ring at a party in New York earlier this month, with witnesses guessing it could be vintage.
A source said: "It wasn`t huge. It looked vintage and might have been custom made."
Justin, 31, is said to have proposed to the 31-year-old actress last year during a pre-Christmas break in Jackson, Wyoming, after they reunited following a three-month split.
A source said at the time: "Justin knows how much she loves snowboarding and the mountains, so it was the perfect place.
"This was the basis for getting back together. When they reunited they had a conversation about taking the next step."
The couple - who have dated on-and-off for the past four years - are believed to have then celebrated their engagement with their family and friends at Justin`s home in Big Sky, Montana.
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