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.

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

Princess Kate and Prince William have sent a public message to the Duchess of Edinburgh. Sophie, who married Prince Edward in 1999, is celebrating her 60th birthday. The Prince and Princess of Wales posted on social media: "Wishing The Duchess of Edinburgh a very happy 60th birthday today!

The Princess of Wales celebrates her 43rd birthday today with her beloved family - but will she be left surprised by her relatives as she continues her recovery from cancer

Through what's been a challenging year for the royal family, Prince William and Princess Kate's relationship has taken center stage, and according to royal sources, they've only come out of 2024 stronger.

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.