It should be one of the happiest times of her life, but the upcoming wedding of her eldest daughter has turned into an emotional battlefield for Nicole Kidman. Last week her ex-husband, Tom Cruise, reportedly told the Aussie actress that, because she’s not a Scientologist, she won’t be welcome at Isabella’s big day.

Now, after 11 years of watching from afar as Isabella, 19, and her brother Connor, 17, are raised as devotees of the controversial religion, Nicole has declared war, moving her family into a home just 10 minutes away from Tom’s Beverly Hills mansion as she prepares to fight tooth and nail to stop being cut out of her oldest children’s lives. Relocating her and husband Keith Urban’s two young daughters, Sunday, 3, and Faith, 1, from the rural utopia of their Nashville farm to the bright lights of LA is a decision Nicole hasn’t taken lightly, insiders say.

“Nic is heartbroken that it has come to this, but she won’t let Tom erase her from Bella’s life,” reveals one close friend. “They adopted her and Connor together, and Nicole loved her the same way she loves Sunday and Faith. “In the years since the divorce, Nicole has tried to keep that special bond with Bella by having her come down to Australia and by flying her out to Tennessee, but Tom has made it harder and harder.

“Now she is going to make damn sure that Bella isn’t being brainwashed and pressured into a marriage she isn’t ready for, just because Tom wants her to marry some Scientology protégé – even though he thinks it would be wonderful for Bella.” Alarming new details about Isabella’s boyfriend, 23-year-old Eddie Frencher, have surfaced, including claims that he is seen as a “prophet” by Tom and senior Scientologists.

Read our exclusive interview with a former Scientologist who has met both Tom and the organisation’s leader, David Miscavige, and reveals the true extent of the battle Nicole now faces in this week's Woman's Day on sale February 13, 2012.