Kidman has no plans for memoir

Nicole Kidman attends the UK premiere of 'Australia' at the Odeon Cinema, Leicester Square on December 10, 2008 in London, England. (Dave Hogan, Getty Images)

Tom Cruise has nothing to fear from his ex-wife Nicole Kidman - she plans to take their marriage secrets to the grave.

The actress insists she'll never tell all in an expose and she'll always stay tight-lipped about her almost 10-year marriage to Top Gun star Cruise, their adopted children and his Scientology beliefs.

In a revealing new Ladies Home Journal interview, the Australia star says, "I would never write a memoir. There are things that happen behind closed doors, and that's where they belong. I'm not secretive. I'm protective."