Keith Urban is facing swirling rumors of infidelity as his high-profile divorce from Nicole Kidman gathers pace – a development sources tell RadarOnline.com could jeopardize millions of dollars tied up in their prenup.

Kidman, 58, filed for divorce recently after 19 years of marriage to the country singer, 57. Court papers lodged in Nashville cite "irreconcilable differences," while friends of both stars describe a relationship long strained by clashing work schedules and distance. Article continues below advertisement

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A source close to the situation claimed: "The talk is that Keith may have been unfaithful, and that could open

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