Australian actress Nicole Kidman is set to wed country music star Keith Urban in Sydney on June 25, but the location of the actual ceremony is under wraps.

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Kidman, who was married to Tom Cruise for 11 years, is planning a traditional church wedding. Her two adopted children, Isabella, 13, and Conor, 11, will be flying in for the event, hellomagazine.com reported.

The couple has tried to ensure that the occasion is kept very private. Guests have been asked to check into a five-star hotel the day before so that invitations might be delivered to them, specifying the exact time and place.

It has been rumored that every helicopter in the area was reserved to prevent paparazzi from crashing the party, the Web site said.

Because the actress turns 39 this weekend, her sister Antonia has planned a combined birthday and bachelorette party.