The Hollywood stars who joined the happy couple included Justin Theroux, Gwen Stefani, Gavin Rossdale, Gwyneth Paltrow, Jon Favreau and Reese Witherspoon, reported Femalefirst.
"It was a great weekend for Susan, and Robert went all out to make sure she knows how special she is.
"Around 50 of their closest friends came up for the weekend and stayed at the hotel in historic houses. It was a very relaxing weekend and there was a lot of time for people to catch up," a source said.