The princess hears from a mum who sought help after her daughter begged her to stop drinking.
Cruise has known the royal couple for a number of years and also met William's mother, Princess Diana, and attended her funeral in 1997.
William and Catherine renew their friendship with the Hollywood star at the premiere for his film Digger.
The row threatens to overshadow a very crowded day for the royals - with the King and Princes William and Harry all attending events.
Noor Nanji reports from outside Buckingham Palace, as the row over Earl Spencer's book threatens to overshadow a crowded day for the Royal Family.
The princess completed the Three Peaks Challenge in aid of the hospital where she was treated for cancer.
The Princess of Wales has made a surprise appearance alongside her husband the Prince of Wales, as he gave an impassioned call to the sports sector to help prevent suicides.
The prince's new project aims to use the reach of sport to raise awareness about suicide and show people the help available in a crisis.
The 13 year old was dropped off at the all-boys boarding school by his parents, Prince William and Princess Catherine of Wales.
