Nicole Kidman 's decision to quietly apply for residency in Portugal has emerged as the clearest indication yet her marriage to Keith Urban was under strain, with the couple's divorce now being described by insiders as the "worst kept secret in showbiz", RadarOnline.com can reveal.

The 58-year-old Big Little Lies star submitted paperwork to Portuguese authorities in July, just two months before news of the couple's separation became public. Article continues below advertisement

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At the time, her move was presented as a lifestyle choice, but those close to her now believe it signaled deeper issues in her 19-year marriage t

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