Carrie Underwood believes her son Isaiah has the "biggest" shot of becoming a singer.
The 41-year-old country superstar - who rose to fame after winning the fourth season of 'American Idol' in 2005 - believes both the 10 year old and her other child Jacob, five, are showing signs of musical talent but her younger boy is more likely to follow in the footsteps of his dad, retired NHL player Mike Fisher, than hers.