Nicole Kidman's sister has jetted to the actress' side to help her cope with the news her husband Keith Urban has checked himself into rehab to battle alcoholism Pregnant ANTONIA KIDMAN flew out of Sydney, Australia yesterday (25OCT06), according to local media reports, so she could spend what her sister and her country star husband had hoped would be their first birthday celebration as man and wife Urban turns 39 today (26OCT06) Aussie TV personality Antonia has reportedly rescheduled filming on her upcoming series FROM HERE TO MATERNITY Urban will spend his birthday alone at a Nashville, Tennessee drug and alcohol treatment facility