The magazine adds that Kenny’s former wife, actress Renée Zellweger, a close friend of Nicole, will also attend.

Keith and his family have gathered in Australia as they prepare for the big day.

Keith’s brother Shane, rumored to be the best man, told Access Hollywood, “I’m really happy to be here,” but did not know if Keith was planning to serenade his bride at the ceremony. “I don’t know anything until we get where we’re going.” Shane added that he had “no idea” about location, time or any other details. The Herald Sun of Australia, however, reports that the 35-minute service will feature classical music and a string quartet from the Sydney Symphony Orchestra, along with gospel readings chosen by Nicole’s mother Janelle. Nicole’s sister Antonia is said to be the matron of honor. Keith has also invited several industry people, including his label president Mike Dungan, producer Dann Huff and songwriter Monty Powell, to the wedding. The service is reported to be a black-tie event, with no cameras or cellphones allowed.