Article continues below advertisementNicole Kidman is secretly preparing for an emotional holiday reconciliation with her estranged ex-husband Keith Urban, with friends telling OK! she is driven by one powerful reason - their daughters' heartbreak over their shock separation.Two months after Kidman, 58, shocked Hollywood by filing for divorce and ending her nearly 20-year marriage to Urban, also 58, the actress is now planning to reunite with Urban over Christmas, sources say.