How Prince William masked personal pain over Kate Middleton's cancer diagnosis: Prince of Wales returned to work as his wife and King Charles both battled disease, juggling royal duties with looking a

Prince William has continued to put on a brave face while juggling royal duties with looking after his family as his wife battles cancer - and the Princess of Wales will be back by his side for the Trooping the Colour tomorrow. Prince William will have the Princess of Wales back by his side as she returns for the Trooping the Colour tomorrow A stunning new portrait of the Princess of Wales taken at Windsor this week by Matt Porteous The photograph was taken by Matt Porteous, a favourite private photographer of the couple Kate has not been at a formal royal engagement since the Christmas Day Sandringham service Princess Catherine has thanked the public for their support as she revealed she will be making a surprise appearance on the Buckingham Palace balcony. In her message the Princess says she has been 'blown away' by all the kind messages of support and encouragement over the last couple of months APRIL 18: The Prince of Wales initially postponed engagements to look after Kate but returned to duties in April where he visited a food distribution charity in Surrey APRIL 25: Prince William speaks with students of the Matrix Project, during a visit to St Michael's Church of England High School in Sandwell, West Midlands APRIL 25: The Prince of Wales surprised a young schoolboy who had invited the royal to see their mental health initiatives Here, he promised to 'look after' his wife and was handed two get well soon cards, addressed to Kate and King Charles - who has also been battling cancer. MAY 10: Prince William, Prince of Wales, known as the Duke of Cornwall when in Cornwall, breaks ground for the new facility during a visit to St. Mary's Community Hospital MAY 13: King Charles III and Prince William, Prince of Wales share a joke during the official handover in which King Charles III passes the role of Colonel-in-Chief of the Army air corps to Prince William MAY 21: Prince William meets guests at a Garden Party at Buckingham PalacE MAY 22: Footballer Lauren Hemp is made a Member of the Order of the British Empire by the Britain's Prince William at Windsor Castle Before the England squad left for Germany, William was in good spirits as he shared some advice that his youngest son, Louis, had shared. JUNE 5: The Prince of Wales speaks at the UK's national commemorative event for the 80th anniversary of D-Day, hosted by the Ministry of Defence on Southsea Common in Portsmouth JUNE 6: prince William, the Prince of Wales, greets Canadian veterans at a ceremony to mark the 80th anniversary of D-Day at Juno Beach in Courseulles-sur-Mer, Normandy, France JUNE 6: William attends the international ceremony marking the 80th anniversary of the 1944 D-Day landings Three days before Kate's emotional video announcement, William also attended a conference to help end homelessness in the Millennium Gallery in Sheffield.