A huge tent was put up on Diaz's property for the ceremony and reception - the latter dimly lit with lots of candles and mostly white flowers. Witherspoon and Gwyneth Paltrow were among several celebrity guest in attendance. Benji's twin brother, Joel, was also spotted arriving at their home in the early afternoon. "It was a big wedding, but they still managed to make it feel very personal.

Only their families and very special friends attended," a source tells PEOPLE. "It all felt very down-to-earth and sweet. Guests arrived smiling and almost seemed giddy. Everyone was excited to be a part of the wedding."