Reese Witherspoon :: A Monique Lhuillier design Dress for Wedding

Hollywood Actress Reese Witherspoon set a don a Monique Lhuillier designed wedding dress for an engagement she's been less than forthcoming about it.

The bride-to-be, 34, will wear a Monique Lhuillier design when she says her I do to Toth, 40.

 A  source tells the new Us Weekly of the dress designer ::
"She's spending most of her time on that dress,"

To ensure she looks gorgeous in the custom gown,she has been breaking a sweat in 75-minute hot vinyasa yoga classes and added body scrubs and facials from Ona Spa to her routine.

As for the locale, the nuptials will take place at the star's Ojai, Calif. ranch. "The wedding will be in the early evening in one of the fields behind the house," reveals an insider.

Watch Reese Witherspoon Video::