Kate Middleton and Prince William are "more open" and "talk about their relationship together" amid her cancer journey, a source tells PEOPLE.

When Kate Middleton celebrated her 43rd birthday on January 9, her husband Prince William wrote a tender message and shared it on the couple’s public Instagram account. According to royal expert Ingrid Seward of Majesty magazine, the display of affection was a sign that the couple has grown closer following Kate's cancer diagnosis in early 2024.

Princess Kate and Prince William have shown unprecedented openness about their relationship following Catherine's cancer journey, according to sources close to the royal household. A source told People magazine that the Prince and Princess of Wales are "more open" now and "talk about their relationship together.

The Prince of Wales, 42, went to Monaco on the south coast of France on Tuesday to watch his beloved Aston Villa play in the UEFA Champions League against AS Monaco. His solo appearance at the game comes after his wife Kate Middleton announced that she is in "remission" from cancer on Jan. 14.

Earlier today, Prince William had an official royal engagement in London, in which he visited homelessness charity Centrepoint. Just hours after his public appearance, the Prince of Wales jetted off to Monaco where he was photographed watching his favorite soccer team, Aston Villa, compete in the UEFA Champions League.

Kate Middleton and Prince William met while studying at St Andrews University and returned to the institution in 2005 for their joint graduation ceremony

The royal was spotted with two of his longtime pals watching their favorite soccer team Aston Villa in a high-pressure match.

The Prince of Wales made a surprise appearance in Monaco on Tuesday, where he was spotted watching Aston Villa play in the Champions League with one of his closest friends and Princess Charlotte's godfather,