"We did a really, really campy wedding vow renewal ceremony," she told US Weekly and other reporters on Wednesday night.
Williams-Paisley, 43, said the ceremony took place at a friends house and that the couple's sons Huck, 8, and Jasper, 5, were also involved.
"We had a traditional wedding march. ... Our processional walk," she added. "It was very casual and very campy and silly. It was perfect."
In fact, a friend surprised Williams-Paisley by buying her a new wedding dress.
"It was pretty awesome. One of my best friend’s went and bought it for me. It was a surprise, I didn’t know we were doing it," she said.
Brad, 42, and his bride first tied the knot in 2003.