The "Moulin Rouge!" star and the country singer, who married in 2006, welcomed little Sunday Rose in to the world in July 2008.
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The actress was recently spotted sporting a fuller figure than usual, prompting speculation she was expecting again. But her representative tells GossipCop.com Kidman is "absolutely, positively not pregnant."
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Kidman also has two children, Bella and Connor, from her marriage to Tom Cruise.