Her publicist, Andrew Farr, confirmed on Monday that the couple had "recently" decided to get divorced.
"It is very friendly. But they don't want to talk about it," Farr told Die Burger. The couple married in October 2007.
The restaurant The Library in Stellenbosch, which Van der Westhuizen and Visser began together, closed down earlier this year.
They also made the news earlier this year as one of the glamour couples who took part in an awareness campaign against domestic violence by appearing naked in the February issue of the Marie Claire magazine.
"Our relationship is based on good morals, but not everyone wants to see us happy. We are continuously hearing rumours that we are about to get divorced," Van der Westhuizen said then.
Farr said Van der Westhuizen didn't want to personally comment on the planned divorce proceedings.
Visser couldn't be reached for comment.