Kate Middleton is celebrating her 43rd birthday and "looking after herself" after completing chemotherapy treatment, a family friend tells PEOPLE.

As the Princess of Wales turns 43 on Thursday January 9, the much loved royal's life is world 's away from where it was at the same time last year

Kate, the Princess of Wales, turns 43 on Thursday, capping what was a tumultuous year for the mother of three and wife of Prince William. Kate, who was born Jan. 9, 1982, is expected to spend her birthday privately with William and their kids -- Princes George and Louis and Princess Charlotte -- at home in Windsor,

Prince William has showered love on wife Kate Middleton in heartfelt birthday wish as the future queen turns 43.On official Instagram account of the Prince and Princess of Wales, the future king shared a beautiful and never-before-seen photo

The King and Queen were among the first to issue birthday wishes for the Princess of Wales King Charles and Queen Camilla are leading the way in wishing Kate Middleton a happy birthday. The Princess of Wales turned 43 on Thursday,

Princess Kate Middleton will soon be ringing in her 43rd birthday and a source says Prince William and their children are pulling out all the stops to make it as special and family-oriented as possible.

Kate Middleton is celebrating her 43rd birthday today, with the royal family sharing a loving tribute on social media to mark the Princess of Wales' special day

The Princess of Wales is celebrating her 43rd birthday on Thursday after a difficult, challenging year. Kate will be marking the occasion at home in Windsor, with husband the Prince of Wales and their children,